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tuthanhthuy0
2 năm trước
Cho pt : X^2 -(k+1)x +k = 0 1CMR với mọi giá trị của k, phương trình luôn có hai nghiệm 2 gọi x1 x2 là nghiệm của pt . tìm giá trị nhỏ nhất của P= x1^ + x2^
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