问题标题:
x^2-xy-4+2y因式分解
问题描述:
x^2-xy-4+2y因式分解
冒东奎回答:
x^2-xy-4+2y因式分解
=x^2-4+2y-xy
=(x+2)(x-2)+y(2-x)
=(x+2)(x-2)-y(x-2)
=(x-y+2)(x-2)
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