S
sagacious


[toán 9] chứng minh
cho a,b,c> thỏa a+b+c=3abc
[TEX]\frac{1}{a^3}+\frac{1}{b^3}+\frac{1}{c^3} \geq 3[/TEX]
cho a,b,c> thỏa a+b+c=3abc
[TEX]\frac{1}{a^3}+\frac{1}{b^3}+\frac{1}{c^3} \geq 3[/TEX]
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