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Ai giúp tui với bài lớp 9 nè?
cho các số thực a,b,c đôi một khác nhau thỏa mãn 0<=a;b;c<=2. Chứng minh rằng: 1/(a-b)^2+1/(b-c)^2+1/(c-a)^2>=9/4
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- Anonymous4 years ago
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- Anonymous4 years ago
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- Anonymous4 years ago
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