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  1. NguyenMinhHai

    Made a comment, 11-12-2022 - 21:52

    cho ba số a,b,c khác 0 thỏa mãn a^2/b^2+b^2/c^2+c^2/a^2=a/c+c/b+b/a. Chứng minh rằng a=b=c

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