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dquynh1607
2 năm trước
Thực hiện phép tính: a) 5x 2 (4x 2 – 2x + 5) b) (6x 2 - 5)(2x + 3) Phân tích đa thức thành nhân tử: a) 7xy^ 2  + 5x^ 2 y b) x ^2 + 2xy + y 2 – 11x -11y c) x ^2 – x – 12
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