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There have been 24 items by darkangle249 (Search limited from 19-05-2020)

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Cho tứ giác ABCD nội tiếp trong đường tròn (O) có 2 đường... in Hình học Started by darkangle249, 07-10-2021	0 replies 388 views	darkangle249 07-10-2021
Cho 650 điểm nằm trong một hình tròn với bán kính 16.Chứn... in Toán rời rạc Started by darkangle249, 03-06-2021	1 reply 587 views	Einstein1431879 17-07-2021
$\sqrt{a}+\sqrt{b}+... in Bất đẳng thức và cực trị Started by darkangle249, 27-06-2021	2 replies 620 views	PDF 07-07-2021
$\frac{ab}{\sqrt{ab+bc... in Bất đẳng thức và cực trị Started by darkangle249, 25-05-2021	1 reply 508 views	Dark Repulsor 03-07-2021
$\frac{x}{y(z+1)(y+z)^{2... in Đại số Started by darkangle249, 28-06-2021	1 reply 669 views	Dark Repulsor 30-06-2021
$a+b+c+\sqrt{3}\geq 8abc\su... in Đại số Started by darkangle249, 27-06-2021	1 reply 562 views	Dark Repulsor 29-06-2021
$\sum \frac{1}{\sqrt... in Đại số Started by darkangle249, 28-06-2021	0 replies 693 views	darkangle249 28-06-2021
chứng minh tam giác $DEF$ cân in Hình học Started by darkangle249, 26-06-2021	1 reply 354 views	Dark Repulsor 27-06-2021
$2.\sum \frac{x}{\sqrt... in Bất đẳng thức và cực trị Started by darkangle249, 22-06-2021	1 reply 1291 views	ChiMiwhh 23-06-2021
$\sum \frac{\sqrt{x^{2... in Bất đẳng thức và cực trị Started by darkangle249, 22-06-2021	1 reply 544 views	ChiMiwhh 23-06-2021
Tìm min S=a+b+c in Bất đẳng thức và cực trị Started by darkangle249, 30-05-2021	2 replies 567 views	PDF 22-06-2021
$\sum \frac{a^{5}+b^{5... in Bất đẳng thức và cực trị Started by darkangle249, 16-06-2021	2 replies 505 views	ChiMiwhh 17-06-2021
$\frac{3ab+5a}{b^{2}+4... in Bất đẳng thức và cực trị Started by darkangle249, 16-06-2021	1 reply 781 views	Mrwhite320064 16-06-2021
Tìm $x,y,z$ nguyên dương thỏa mãn $xy(x+y)... in Số học Started by darkangle249, 11-06-2021	0 replies 683 views	darkangle249 11-06-2021
Chứng minh rằng trong mọi đa giác đều 2n đỉnh, tồn tại mộ... in Toán rời rạc Started by darkangle249, 31-05-2021	1 reply 632 views	chanhquocnghiem 31-05-2021
$\sum \frac{1}{a^{2... in Bất đẳng thức và cực trị Started by darkangle249, 23-05-2021	12 replies 1000 views	ChiMiwhh 28-05-2021
$\sum ab\sum \frac{ab}... in Bất đẳng thức và cực trị Started by darkangle249, 27-05-2021	3 replies 522 views	darkangle249 28-05-2021
$\frac{ab}{\sqrt{ab+bc... in Bất đẳng thức và cực trị Started by darkangle249, 23-05-2021	0 replies 325 views	darkangle249 23-05-2021
$\frac{a}{b}+\frac... in Bất đẳng thức và cực trị Started by darkangle249, 23-05-2021	1 reply 448 views	PDF 23-05-2021
$\sqrt{\frac{a}{a+b}}+\sqrt{\fra... in Bất đẳng thức và cực trị Started by darkangle249, 22-05-2021	5 replies 749 views	darkangle249 23-05-2021
$\sqrt{\frac{a}{a+b... in Bất đẳng thức và cực trị Started by darkangle249, 22-05-2021	0 replies 315 views	darkangle249 22-05-2021
$\sqrt{\frac{a}{a+b... in Bất đẳng thức và cực trị Started by darkangle249, 22-05-2021	0 replies 302 views	darkangle249 22-05-2021
$\sum \frac{ab}{a^{2}+ab+b^{2}}+1\geq... in Bất đẳng thức và cực trị Started by darkangle249, 20-05-2021	13 replies 547 views	darkangle249 21-05-2021
\sum \frac{ab}{a^{2}+a... in Bất đẳng thức và cực trị Started by darkangle249, 20-05-2021	0 replies 880 views	darkangle249 20-05-2021

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