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There have been 26 items by 98dfgfdubvh (Search limited from 03-06-2020)

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CMR $\frac{x^2+y^2+z^2}{xyz+1... in Số học Started by 98dfgfdubvh, 06-05-2024	1 reply 1589 views	nhungvienkimcuong 09-05-2024
$A=2ab+3ca-6bc$ in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 20-04-2024	1 reply 1678 views	dinhvu 20-04-2024
với mọi cặp số nguyên dương a, b được tô khác màu thì tôn... in Toán rời rạc Started by 98dfgfdubvh, 13-04-2024	1 reply 1995 views	hovutenha 14-04-2024
$a=b=c=d=e$ in Đại số Started by 98dfgfdubvh, 13-04-2024	0 replies 1666 views	98dfgfdubvh 13-04-2024
$a=b=c=d=e$ in Đại số Started by 98dfgfdubvh, 13-04-2024	0 replies 1411 views	98dfgfdubvh 13-04-2024
$\sum \frac{1}{\sqrt... in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 13-04-2024	0 replies 1542 views	98dfgfdubvh 13-04-2024
$\frac{xy}{3y+1}$ in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 23-03-2024	1 reply 1155 views	MHN 23-03-2024
$ T = abc.$ in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 26-02-2024	2 replies 1759 views	dinhvu 27-02-2024
$p = 3a^2 + b^2+c^2$ in Số học Started by 98dfgfdubvh, 23-02-2024	1 reply 1458 views	dinhvu 23-02-2024
Tồn tại 4 số nguyên dương $a,b,c,d$ cùng màu để... in Toán rời rạc Started by 98dfgfdubvh, 23-12-2023	0 replies 1154 views	98dfgfdubvh 23-12-2023
Mọi tập con $k$ phần tử của tập $A$ đ... in Toán rời rạc Started by 98dfgfdubvh, 17-12-2023	1 reply 1542 views	Duc3290 17-12-2023
Tồn tại 4 số $a,b,c,d$ để $(a - b)(c-d)... in Toán rời rạc Started by 98dfgfdubvh, 10-12-2023	1 reply 1464 views	Duc3290 10-12-2023
$\sum \frac{1}{a+3b}... in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 02-12-2023	1 reply 1335 views	Hahahahahahahaha 02-12-2023
cmr a+b+2$\geq (a+b)^2$ in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 12-10-2023	0 replies 1121 views	98dfgfdubvh 12-10-2023
Chứng minh rằng $(abc)^2(a^2+b^2+c^2) \leq 3$ in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 25-08-2023	3 replies 504 views	HaiDangPham 30-08-2023
$CMR: (abc)^2(a^2+b^2+c^2)\leq 9$ in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 25-08-2023	0 replies 161 views	98dfgfdubvh 25-08-2023
$\frac{x}{2}+\frac... in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 19-08-2023	3 replies 275 views	HaiDangPham 19-08-2023
$\frac{3}{x}+\frac... in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 18-08-2023	1 reply 254 views	thvn 18-08-2023
$a^2+b^2+c^2 \geq \frac{9abc}... in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 14-08-2023	4 replies 308 views	HaiDangPham 15-08-2023
$\sqrt{a^2+ka+1} + \sqrt{b^... in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 12-08-2023	0 replies 233 views	98dfgfdubvh 12-08-2023
Chứng minh $a^2 +4b^2<1$ in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 12-08-2023	1 reply 292 views	truongphat266 12-08-2023
Chứng minh $EX \perp CD$ in Hình học Started by 98dfgfdubvh, 11-08-2023	0 replies 320 views	98dfgfdubvh 11-08-2023
Chứng minh $OI \perp BC$ in Hình học Started by 98dfgfdubvh, 08-08-2023	2 replies 408 views	QuocMinh2k8 10-08-2023
Phương Pháp biến đổi tương đương trong bất đẳng thức in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 05-08-2023	5 replies 393 views	ma29 06-08-2023
Phương Pháp biến đổi tương đương trong bất đẳng thức in Bất đẳng thức và cực trị Started by 98dfgfdubvh, 06-08-2023	1 reply 265 views	ma29 06-08-2023

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