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Cho tớ hướng làm nhanh nhé!!!!! Cho a, b, c >0, thỏa mãn a+b+c=0cm: $\frac{1}{a^2 + b^2 + c^2} +\frac{1}{ab} +\frac{1}{bc} + \frac{1}{ca}$ $\geq 30$Cho a, b, c >0, thỏa mãn a+2b+4c=12 Cm: $\frac{2ab}{a+2b} +\frac{8bc}{2b+4c} + \frac{4ac}{4c+a}$ $\leq6 $
Giúp !!!!!!!!!!!! Cho a, b, c >0, thỏa mãn a+b+c=0cm: $\frac{1}{a^2 + b^2 + c^2} +\frac{1}{ab} +\frac{1}{bc} + \frac{1}{ca}$ $\geq 30$Cho a, b, c >0, thỏa mãn a+2b+4c=12 Cm: $\frac{2ab}{a+2b} +\frac{8bc}{2b+4c} + \frac{4ac}{4c+a}$ $\leq6 $
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