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04-05-2017 - 16:23
Cho a+b>=2. chứng minh: a+b<a^2+b^2<a^3+b^3<a^4+b^4
26-04-2017 - 08:57
Xin mọi người hướng dẫn giải bài toán sau. Cảm ơn nhiều.
Cho a, b, c > 0. Chứng minh rằng: