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2 năm trước
Phân tích đa thức thành nhân tử 1. $x^{2}$ -2x- $y^{2}$ +2y 2. 4$x^{2}$-25+(2x+7)(5-2x) $x^{2}$ $x^{2}$ $x^{2}$ $x^{2}$
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