Cho a, b, c$\geq 1$. $3a^2+4b^2+5c^2=52$
Tìm min A=a+b+c
15-04-2017 - 22:59
Cho a, b, c$\geq 1$. $3a^2+4b^2+5c^2=52$
Tìm min A=a+b+c
03-04-2017 - 12:10
Giải pt:
$2x+3+\sqrt{4x^2+9x+2}=2\sqrt{x+2}+\sqrt{4x+1}$
14-03-2017 - 19:25
Cho x, y, z thỏa mãn: $\frac{2}{x}+\frac{2}{y+z}=\frac{3}{y}+\frac{3}{z+x}=\frac{4}{z}+\frac{4}{x+y}=1$
Tính $\frac{1}{x}+\frac{1}{y}+\frac{1}{z}$
10-03-2017 - 12:00
Giải phương trình;
$\sqrt{2-\sqrt{2}(x+1)}+\sqrt[4]{2x}=1$
26-02-2017 - 20:14
$\left\{\begin{matrix} \sqrt{x-1}-\sqrt{y+3}=-1\\ x^{3}+y^{3}-4x^2+3y^2+8x+4y-16=0 \end{matrix}\right.$
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