x^2-xy-4+2y因式分解
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x^2-xy-4+2y因式分解
![x^2-xy-4+2y因式分解](/uploads/image/z/19319589-45-9.jpg?t=x%5E2-xy-4%2B2y%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3)
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 )
= x^2-4+2y-xy
= (x+2) (x-2) + y ( 2-x)
= (x+2) (x-2) - y (x-2)
= (x-y+2 ) (x-2 )