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letrungthanh2701
2 năm trước
Nhân tài giúp đỡ e ah ! CMR: Nếu pt: $x^{3}$ - a $x^{2}$ +bx+c=0 có 3 nghiệm lập thành 1 cấp số cộng thì 9ab=2 $a^{3}$ +27c
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