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NgThai2008
1 năm trước
Gọi S là tập các giá trị của m để bất phương trình x^2 - 2mx + 5m - 8 ≤ 0 có tập nghiệm là [ a;b] sao cho b - a =4. Tổng tất cả các phần tử của S là?
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