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baquyencr7
2 năm trước
Cho `a,b,c` dương thoả mãn: `a+b+c=3`. Tìm GTNN của: `A=frac{1}{1+a^2}+frac{1}{1+b^2}+frac{1}{1+c^2}` #Chi tiết từng bước ( có lời dẫn giải thì càng tốt )
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