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2 năm trước
Cho a,b;c>0 tm: a+b+c=3 CM: $\frac{a^{3} }{(a+1)(b+1)}$ + $\frac{b^{3} }{(b+1)(c+1)}$ + $\frac{c^{3} }{(c+1)(a+1)}$$\geq$ $\frac{3}{4}$
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