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tienqm123


Cho a;b;c >0 . Chứng Minh rằng :
[TEX]\frac{a^3}{(a+b)(a+c)}[/TEX] + [TEX]\frac{b^3}{(a+b)(b+c)}[/TEX] + [TEX]\frac{c^3}{(c+b)(a+c)}[/TEX] >= [TEX]\frac{a+b+c}{4}[/TEX]
[TEX]\frac{a^3}{(a+b)(a+c)}[/TEX] + [TEX]\frac{b^3}{(a+b)(b+c)}[/TEX] + [TEX]\frac{c^3}{(c+b)(a+c)}[/TEX] >= [TEX]\frac{a+b+c}{4}[/TEX]
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