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huynhthaoanh12345
2 năm trước
Cho các số thực dương thỏa mãn abc=1. Chứng minh $\frac{a}{(ab+a+1)^2}$ + $\frac{b}{(bc+b+1)^2}$ + $\frac{c}{(ca+c+1)^2}$ ≥ $\frac{1}{a+b+c}$ help me❤
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