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ducbui2k5
2 năm trước
Cho phương trình: x^2 - 2(m - 1)x – 3 – m = 0 ( ẩn số x) a) Giải phương trình khi m = 2 b) Chứng tỏ rằng phương trình có nghiệm x1 , x2 với mọi m
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