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vanmanh2001
2 năm trước
Cho PT : x2- 4x - m=0 với x là ẩn số, m là tham số A) Chứng tỏ PT luôn có 2 nghiệm phân biệt với mọi giá trị của m B) Gọi x1, x2 là hai nghiệm của PT Tìm giá trị m để : 2x1 + x2 ( 2 - 3x1) = 8
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