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2 năm trước
1) Nhóm các hạng tử a) 2.x.y - a.x + x^2 - 2.a.y b) x^2 - (a+b)x + ab c) x^n - y^n - x.y^n + x^n+1 d) x^2 + 2.x + 3.x^2.y + 6.x.y + 12.y + 4 2) Đặt nhân tử chung -5.x^m.y - 15.x^n.y ( m > n )
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