TTO - Như đã công bố sẽ tích hợp ìSave as PDF” và ìSave as XPS” vào khả năng sao lưu của bộ công cụ văn phòng Office 2007 mới nhất trong tháng 6 vừa qua, Microsoft đã phát hành phần bổ sung này cho Office 2007 và hoàn toàn miễn phí.

Phần bổ sung này được Microsoft ìthầm lặng” đưa vào Office 2007 Add-in, sẽ hỗ trợ người dùng xuất hay sao lưu theo các định dạng PDF và XPS trong cả tám chương trình trong bộ Microsoft Office 2007. Ngoài ra, người dùng cũng có thể gởi như tập tin đính kèm trong email với định dạng PDF và XPS trong phần phụ của các chương trình này.

Được hỗ trợ bởi Windows Server 2003, Windows XP Service Pack 2, Microsoft sẽ công bố và cho phép tải miễn phí đến tất cả những người dùng đang sử dụng Microsoft Office 2007 có bản quyền, tích hợp vào các chương trình con như Office Access 2007, Office Excel 2007, Office InfoPath 2007, Office OneNote 2007, Office PowerPoint 2007, Office Publisher 2007, Office Visio 2007 và Office Word 2007.

Với động thái cạnh tranh với các bộ công cụ văn phòng miễn phí như OpenOffice, Microsoft sẽ thu hút được nhiều người dùng hơn khi định dạng PDF ngày càng phổ biến và được xem là định dạng văn bản trực tuyến phổ biến nhất.



---------
tuoitreonline

Tin vui cho các Fan MU
Man utd đã có dc Owen Hargeaves

Chắc ko vậy. Nhưng mà chắc phải qua năm mới có hắn phải ko vì TTCN đã đóng cửa

Cập nhật thành viên ngày 12 - 9 - 2006

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2)hungkhtn
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Có ai xài thử Leechget chưa, so sánh giúp mấy chương trình download. Chương trình download nào tốt nhất nhanh nhất?

Nó ở đây nè bạn
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Bác ơi nó ko vào được !!!

Link tốt mà bạn, check lại đi

Chiều hôm qua 10.9, tại thủ đô Kuala Lumpur - Malaysia, vòng chung kết cuộc thi Robocon châu Á - Thái Bình Dương 2006 đã diễn ra. Đội BKPro (Trường ĐH Bách khoa TP.HCM) đã đưa Việt Nam lần thứ 3 đoạt chức vô địch Robocon châu Á - Thái Bình Dương sau khi giành chiến thắng thuyết phục trước đội Robocon Thái Lan trong trận chung kết.



-----------
Thanhnienonline

Mời các bạn giải nài sau
www.diendantoanhoc.net/index.php?showtopic=19988

Vào có được đâu!
PS: spam vừa thôi nhé!

www.diendantoanhoc.net/index.php?showtopic=19988

Tui đã sửa lại đường link, chắc bạn ấy nhầm chút

Bài giải ở đây nhé


http://diendantoanho...topic=14863&hl=

Màu mắt của con người được quyết định bởi cái gì trong mắt?

Câu này chắc dễ quá nhỉ Namk

Màu mắt được quyết định bởi số lượng melanin, một loại sắc tố màu nâu đen có trong mắt. Nếu thiếu melanin, mắt sẽ có màu xanh, còn nhiều melanin mắt có màu nâu. Những người có tóc và da màu sậm thường là những người có hàm lượng melanin cao, do vậy mắt họ thường có màu nâu. Những người có tóc và da màu sáng thường có hàm lượng melanin thấp, mắt họ thường có màu nhạt hơn. Điều này cũng giải thích nguyên nhân phần lớn mắt của trẻ sơ sinh thường sáng màu hơn so với người lớn, do hàm lượng melanin của trẻ sơ sinh còn thấp.

Màu mắt của con người được quyết định bởi cái gì trong mắt?

Câu này chắc dễ quá nhỉ Namk

MU lại thắng!!!!!!!!!!!!!!!
Whoooooooohooooooooooooooo

đây là 1 bài toán rất lãng mạn, và để có dc sự lãng mạn thì phải có chông gai, và đây là 1 ví dụ:
cho 1 tam giác bất kỳ ABC. từ mỗi đỉnh ta vẽ 2 đoạn thẳng chia mỗi góc thằng 3 góc bằng nhau. CM: tam giác tạo bởi những đoạn thẳng đóa là 1 tam giác đều.

cái này gọi là tam giác Morley(ông ấy mất 4 năm để làm dc, mình thì mất 1 năm....để hiểu ổng giải thế nào)^^

Về tam giác Morley thì trên diễn đàn cũng đã có vài thảo luận, nó có liên quan đến bài toán chia 3 một góc khá nổi tiếng.


Xem thêm ở đây
http://mathworld.wol...eysTheorem.html
http://mathworld.wol...eyTriangle.html

Encyclopedia of World Biography on Augustin Louis Cauchy

The French mathematician Augustin Louis Cauchy (1789-1857) provided the foundation for the modern period of rigor in analysis. He launched the theory of functions of a complex variable and was its authoritative pioneer developer.

Augustin Louis Cauchy was born in Paris on Aug. 21, 1789, 38 days after the fall of the Bastille. His father, Louis François, was a parliamentary lawyer, lieutenant of police, and ardent royalist. Sensing the political wind, he moved the family to his country cottage at Arcueil, where they lived for nearly 11 years. Here young Cauchy received a strict religious education from his mother and an elementary classical education from his father, who wrote his own textbooks in verse.

By 1800 the political situation had stabilized and the family moved back to Paris. At the age of 16 Cauchy entered the École Polytechnique, at that time the best school in the world for a budding mathematician. Originally designed to produce military engineers for the Revolutionary armies of France, the school developed as a revolutionary (in method) educational institution. Teaching was linked with research as the nation's finest mathematicians created pure mathematics in discussion with their students and showed them how mathematical theory and practice nourished one another at the very edge of invention.

As Lagrange and Laplace had predicted, Cauchy was a brilliant academic success. In the realm of personal relationships he was not so successful. The generally anticlerical polytechnicians simply could not believe that a brilliant student as aggressively pious and evangelically Catholic as Cauchy could exist. His imperturbability on the matter progressively amused, bewildered, irritated, and infuriated them. It was a pattern of responses that was to become typical in his social relationships. Many years later, after Cauchy had become the most influential mathematician in the world, the naive young genius Abel would conclude that Cauchy was insane. How else could a man of science be so bigoted in religious matters?

From Engineer to Mathematician

From the Polytechnique, Cauchy passed to the École des Ponts et Chaussées, where he studied engineering for 3 years. Upon graduation in 1810, he was sent to Cherbourg as a military engineer. But he could not stay away from pure mathematics. In his spare time he began to review all mathematics, "clearing up obscurities" and inventing new methods for the "simplification of proofs and the discovery of new propositions." He displayed the power and originality of these methods in a series of papers that impressed even the sophisticated mathematical community of Paris. Among these researches were two on polyhedrons, one on symmetric functions, and one on determinants. In the last paper Cauchy reorganized all that was then known about the subject and gave the word "determinant" its modern meaning. All this spare-time work had two results: it broke Cauchy's health, and he abandoned engineering to devote his life to mathematics.

If the mathematical community had been impressed by Cauchy the hobbyist mathematician, it was dazzled by Cauchy the full-time professional. In 1815 he proved a Fermat conjecture on polygonal (figurate) numbers that had defeated some of the world's best mathematicians. In the following year he demonstrated his versatility by winning the grand prize of the Académie des Sciences with a mathematical treatment of wave propagation on the surface of a fluid. Meanwhile, he had obtained his first teaching position, at the Polytechnique. He was appointed professor there in 1816, and before long he was also lecturing at the Collége de France and the Sorbonne.

At the age of 27 Cauchy was elected to the Académie des Sciences-an unusual honor for so young a man. In his case, there were some who insisted that there was nothing honorable about it. The chair which Cauchy filled had belonged to Gaspard Monge, the father of descriptive geometry, first director of the École Polytechnique, and loyal follower of Napoleon I. The restored Bourbon regime demanded that Monge be expelled from the academy. The academicians complied and elected Cauchy in his place. Cauchy, as rigidly ultraroyalist in politics as he was ultra-Catholic in religion, could never see anything improper about the procedure.

In 1818, securely established as the outstanding mathematician of France, Cauchy married Aloise de Bure. They had two daughters.

Prolific Decade

Cauchy worked as if he expected his worth to be measured by the sheer weight of his publications. His ideas, touching upon nearly every branch of mathematics, pure and applied, seemed to materialize as fast as he could write them down. There were occasions when he would produce two full-length papers in one week.

One of Cauchy's major interests in these years was the attempt to repair the logical foundations of analysis in such a way that this branch of mathematics would have "all the rigor required in geometry." This was a problem of long standing.

In his devastating criticism of the Newton-Leibniz calculus, Bishop Berkeley had suggested that the faulty reasoning of the calculus led to correct results because of compensating errors. Maclaurin and Lagrange accepted the criticism and both made heroic efforts to construct a logical justification for the methods of the differential calculus. Neither succeeded.
Cauchy did not quite succeed either. But he took a great step in the right direction when he made the concept of limit the basis for the whole development. His definition of continuity and the derivative in terms of limit was quite modern. But to say that Cauchy" gave the first genuinely mathematical definition of limit, and it has never required modification" is quite wrong.

Cauchy defines "limit" as follows: "When the values successively assigned to the same variable indefinitely approach a fixed value, so as to end by differing from it as little as desired, this fixed value is called the limit of all the others."

As a rough description of the limit idea, Cauchy's "definition" may have merit. But it is verbal, intuitive, crammed with undefined terms, and therefore absolutely nonmathematical in the modern sense. Strangely enough, Cauchy did give a precise mathematical definition of convergent series, and he went on to establish criteria for convergence. It is said that Laplace, after hearing Cauchy's first lectures on series, rushed home in a panic, barred his door, and laboriously tested all the series in his masterpiece, the Mécanique céleste, using Cauchy's criteria. This story, perhaps apocryphal, nevertheless indicates how Cauchy's methods began to set new standards of rigor in analysis.

Between 1825 and 1831 Cauchy published a series of papers which created a new branch of analysis, the theory of functions of a complex variable. It is the principal mathematical tool used in vast domains of physics.

A Matter of Principle

The Revolution of 1830 sent Charles X into exile. The new king, Louis Philippe, demanded oaths of allegiance from the professors of France. Cauchy refused. He had already sworn his oath to Charles. Stripped of all his positions, he exiled himself to Switzerland, leaving his family in Paris.

In 1831 Cauchy was appointed professor of mathematical physics at Turin. Two years later Charles summoned him to Prague to tutor Henri, his 13-year-old grandson. Cauchy, ever the faithful legitimist, agreed to supervise the education of the future pretender. His family joined him in Prague in 1834. Playing Aristotle to Henri's Alexander consumed most of Cauchy's waking hours and sharply curtailed his mathematical output. It never ceased entirely, however. Among the important papers of this period were a long memoir on the dispersion of light, and the first existence proofs for the solution to a system of differential equations.

In 1838 Cauchy and family returned to Paris. Charles had baroneted him, but the title was no help in getting a position, since Baron Cauchy still refused to take the oath. At last, after the Revolution of 1848, the oath was abolished, and Cauchy resumed his old professorship at the Polytechnique. Louis Napoleon reinstituted the oath in 1852, but Cauchy was specifically exempted.

Meanwhile Cauchy's rate of publication reached and even surpassed previous limits. Of special merit in the more than 500 papers that appeared after 1838 were treatises on the mechanics of continuous media, the first rigorous proof of Taylor's theorem, a remarkably modern representation of complex numbers in terms of polynomial congruences, and a collection of papers on the theory of substitutions.

Cauchy's Influence on Mathematics

If the worth of a mathematician were to be measured by the number of times his name appeared in modern college textbooks, Cauchy might be ranked as the greatest of them all. His long-standing influence and fame are due in part to the fact that he swamped the competition with the published word. He was the first mathematician to realize that the greatest material engine of mathematical progress was the printing press. He knew that the entire mathematical community, from professor to arithmetic teacher, took its cue from published papers and textbooks. He literally imprinted his ideas upon a generation.

This practice of rapid publication, together with Cauchy's rather flowery style, had its dangers. Abel, for one, had difficulty in understanding some of Cauchy's papers. "His works are excellent, but he writes in a very confusing manner." But Cauchy's style of writing was the least of the offenses he committed against Abel in particular and mathematics in general. The 15-year delay in the publication of Abel's masterpiece--from 1826 to 1841--was largely due to Cauchy's cavalier treatment of it. Abel died in 1829, the same year in which Cauchy contributed to the suppression of young Galois's epochmaking discoveries. Galois died in 1832. It was this contemptuous attitude toward younger mathematicians, together with his religious and political bigotry, that made Cauchy unpopular with many of his colleagues. After all, it was difficult to overlook the fact that Galois had been a radical republican.

Cauchy died on May 23, 1857, after a short illness. His last words were, "Men die but their works endure."

-----------
Augustin Louis Cauchy from Encyclopedia of World Biography. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.

Biographies of Mathematicians - Cauchy
His Life
Cauchy was born on August 21, 1789 in Paris, France.

Austin Louis Cauchy was born on August 21, 1789 in Paris, France. He was the oldest of six children, born to a Catholic Lawyer, classical scholar, police officer, and strong supporter of the king. With his family, Cauchy's father retreated to the country to escape the gruesome aftermath of the Revolution. For the first twenty years of Cauchy's life he was undernourished, frail, and weak. His father educated him until the age of 13. When Cauchy was young Laplace and Lagrange took part in his mathematical education. Lagrange advised his father to allow his son to have a good knowledge of languages before pursuing mathematics. Between 1802 and 1804 Cauchy attended Ecole Centrale du Pantheon where he studied the classical languages. In 1805 Cauchy took the entrance exam for the Ecole Polytechnique. He was examined by Biot and placed second. There he took courses by Lacroix, de Prony, and Hachette while his analysis teacher was Ampere. After graduating in 1807 Cauchy entered Ecole des Ponts et Chaussees, a engineering school. While he was there he was assigned the Ourcq Canal project under Pierre Girard.

Cauchy took his first job in 1810 at Cherbourg. Here he worked on port facilities for Napoleon's English invasion fleet. While taking a heavy workload Cauchy pursued his mathematical research. In 1811 he proved that the angles of a complex polyhedron are determined by its faces. On this topic Cauchy wrote his first paper and later submitted another paper about polygons and polyhedra. In 1812 Cauchy investigated symmetric functions and submitted a memoir later published in the Ecole Polytechnique in 1815. A memoir on definite integrals was published in 1814, this became the basis of his theory of complex functions.

He was appointed assistant professor of analysis at the Ecole Polytechnique in 1815. The Grand Prix of the French Academy of Science was awarded to him in 1816. Cauchy submitted a paper to the Institute solving one of Fermat's claims on polygonal numbers.

In 1817 Cauchy filled in for Biot at the College de France, where he lectured on the methods of integration. These methods he discovered, but did not publish. Cauchy was the first to make a rigorous study of the conditions of convergence of infinite series in addition to his definition of an integral. Cours d'analyse, text on developing basic theorems of calculus as precisely as possible, was designed for the students at Ecole Polytechnique by Cauchy. He began his study of the calculus of residues in 1826 in Sur un nouveau genre de calcul analogue au calcul infinetesimal while in 1829 in Lecons sur le Calcul Differential he defined for the first time a complex function of a complex variable.

Cauchy was disliked by many of the other scientists. Abel wrote of him after his visit to the Institute in 1826, "Cauchy is mad and there is nothing that can be done about him, although, right now, he is the only one who knows how mathematics should be done." When Cauchy refused to swear an oath of allegiance to the new regime, because of political events in France, he lost all his positions there.

In Turin during 1831 he accepted an offer from the King of Piedmont for a chair of theoretical physics. He taught in Turin and Menbrea attended his courses, he commented, "very confused, skipping suddenly from one idea to another, from one formula to the next, with no attempt to give a connection between them. His presentations were obscure clouds, illuminated from time to time by flashes of pure genius ... of the thirty who enrolled with me, I was the only one to see through it."

In 1833 Cauchy moved from Turin to Prague in order to tutor the grandson of Charles X. As this quote shows he was not very successful, "When questioned by Cauchy on a problem in descriptive geometry, the prince was confused and hesitant ... As with mathematics, the prince showed very little interest ... Cauchy became annoyed and screamed and yelled. The queen sometimes said to him, 'too loud, not so loud'."

There were discussions in Prague with Bolzano about how much Cauchy's definition of continuity is due to Bolanzo. Cauchy's definition was formed before Bolzano's seems to be more convincing, though.

After moving back to Paris in 1838 Cauchy regained his position at the Academy; however, he did not get his teaching positions back because he refused to take the oath. Later in 1839 the position at the Bureau Des Longitudes was open. Although Cauchy was elected, because he did not take the oath he was not allowed to attend any meetings or receive a salary. The mathematics chair at the college de France became vacant in 1843. Cauchy should have easily won on account of his mathematical abilities, but due to religious and political views he was not chosen. During the time after that Cauchy's mathematical output was less than before.

He did important work on applications to mathematical physics, mathematical astronomy, and differential equations. His four volume text Exercises d'analyse et de physique mathemtique was published between 1840 and 1847. Cauchy still did not change in his views and continued to give his colleagues problems. Cauchy stole many of his ideas from his colleagues, they referred to him as "cochon", which is French for pig. In the last few years of his life he had a dispute with Duhamel regarding a result on the inelastic shocks. Cauchy claimed to be the first to give the results in 1832, but Poncelet referred to his own work on the subject in 1826. Even though Cauchy was proved wrong he would never admit it. Cauchy died at about four a.m. on May 27, 1857. His last words were "Men pass away, but their deeds abide". Many terms in mathematics bare his name, the Cauchy integral theorem, in the theory of complex functions, the Cauchy-Kovalevskaya existence theorem for the solution of partial differential equations, the Cauchy-Riemann equations, and the Cauchy sequences. A book of his collected works entitled Oeuvres completes d'Augustin Cauchy (1882-1870) was published in 27 volumes.

Cauchy died on May 23, 1857 in Sceaux, France.

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Cái này để làm gì vậy?

Thử vào đây sẽ biết encarta là gì:
Encarta
Tui cũng thích ái này

Đề bài hoàn toàn đúng  các bạn hãy giải đi nhé

Bác hãy cho đáp số trước đi rồi tớ sẽ tìm ra cách giải!
thật ra bài nay mình thấy sao nó hơi ngộ!
Sau khi biến đổi thì ra là

Vậy thì đáp số đây:
tìm lời giải đi

Đây là loại tam giác đặc biệt, còn nhiều bài hay liên quan đến nó!

Màu mắt của con người được quyết định bởi cái gì trong mắt?

Tải thì được thôi nhưng mà tại sao
"THIS FILE IS FORBIDDEN TO BE SHARED!" ??

Cho hỏi làm thế nào để download file trên oxyshare?

Bác nên nhớ đây là tên một loại thuốc !

Bây giờ lại đi hỏi tên thuốc!!!! Có ý gì đây?!
Tiền ngữ gastro chắc là có liên quan gì hết bao tử, dạ dày đây. Đoán thế

Phình phường mà.

Sorry nhầm, down được rồi, thanks

Homepage:http://www.mackichan.com/
Link down+c*rack:http://rapidshare.de/files/21584435/Scientific.Notebook.v5.0.rar

Sao nó hết cho download rồi, help!