分解因式x^2-xy+2x+y-3````

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分解因式x^2-xy+2x+y-3````

分解因式x^2-xy+2x+y-3````
分解因式x^2-xy+2x+y-3
````

分解因式x^2-xy+2x+y-3````
x^2-xy+2x+y-3
=(x^2+2x-3)-(xy-y)
=(x+3)(x-1)-y(x-1)
=(x-1)[(x+3)-y]
=(x-1)(x+3-y)

等于(X+3)(X-1)-y(x-1)=(x+3-y)(x-1)

x^2-xy+2x+y-3
=(x^2+2x-3)-xy+y
=(x+3)(x-1)-y(x-1)
=(x-1)(x-y+3)