Question

[trần cẩm tú]

cho a b c >0 thỏa mãn a²+b²+c²=1. chứng minh \(\frac{a^2}{1-a^2}+\frac{b}{1-b^2}-\frac{c^2}{1-c^2}\ge\frac{3\sqrt{3}}{2\left(a+b+c\right)}\)