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duong08602
2 năm trước
Cho a,b thỏa mãn a+b=1. Chứng minh rằng: a)a^2+b^2 lớn hơn hoặc bằng 1/2 b)a^3+b^3 lớn hơn hoặc bằng 1/4 Mn giúp e vs ạ e xin cảm ơn
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