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161102944965596
2 năm trước
Giair hộ mình câu 5a, b với ạ, làm ơn làm phước giúp mình đi, thấy ai hỏi cx đc trả lời mà mình lại ko có ai , huhu a, 2(a^4 +b^4) ≥ (a+b)(a3+b^3) b,3(a^4+b^4+c^4) ≥ (a+b+c)(a^3+b^3+c^3)
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