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2 năm trước
Cho phương trình x ² - ( 2m-1 )x+m ² -1 = 0 ( x là ẩn số ) a) Tìm điều kiện của m để phương trình đã cho có hai nghiệm phân biệt b) Định m để hai nghiệm x1 , x2 của phương trình đã cho thỏa mãn : ( x1-x2 ) ² = x1 - 3x2
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