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khanhha9404
2 năm trước
Cho phương trình bậc hai: (m+1)x^2+ (2m+1)x + m – 1 = 0 (1) (m là tham số). Tìm giá trị của m để phương trình (1) có 2 nghiệm phân biệt. Gợi ý: Để phương trình (1) có 2 nghiệm phân biệt : { a khác 0 denta >0
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