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16-04-2016 - 10:21
Giải phương trình: $\sin ^{2}5x-\cos ^{2}3x=\left ( \cos ^{2}5x-\sin ^{2}3x \right )\cos 4x$
21-12-2015 - 15:06
Cho a,b,c dương, abc=1. Chứng minh: $\frac{a}{b^{3}+2}+\frac{b}{c^{3}+2}+\frac{c}{a^{3}+2}\geq 1$
21-12-2015 - 15:02
Cho a,b,c dương, abc=1. Chứng minh:
$\frac{a^{2}}{(a-1)^{2}}+\frac{b^{2}}{(b-1)^{2}}+\frac{c^{2}}{(c-1)^{2}}\geq 1$
17-12-2015 - 21:31
Cho a,b,c,d dương. Chứng minh:
$ab+cd\geq \frac{8}{(a+b)(c+d)}$