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doanquocthangz
2 năm trước
Pt: x² - 2mx + 2m - 3 = 0 a) Chứng minh phương trình luôn có 2 nghiệm phân biệt với mọi m b) Tìm m để x²1 + x²2 + x1 × x2 = 15
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