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linh70911
2 năm trước
Cho 3 số thực a b c thỏa mãn A < b < C Chứng minh phương trình( x -a ).(x - b)+( x - b ).(x- c) +( x - c ).(x - a) = 0 luôn có 2 nghiệm phân biệt
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