H
happy.swan


1, Cho a, b, c >0 và a+b+c\geq6
Chứng minh rằng:
$\frac{a^3}{b+c}+\frac{b^3}{c+a}+\frac{c^3}{a+b}$ \geq 6
2, Cho a, b, c > 0.
Chứng minh :
$\frac{a^5}{b^3}+\frac{b^5}{c^3}+\frac{c^5}{a^3}$ \geq $a^2+b^2+c^2$
Chứng minh rằng:
$\frac{a^3}{b+c}+\frac{b^3}{c+a}+\frac{c^3}{a+b}$ \geq 6
2, Cho a, b, c > 0.
Chứng minh :
$\frac{a^5}{b^3}+\frac{b^5}{c^3}+\frac{c^5}{a^3}$ \geq $a^2+b^2+c^2$