数学小问题.因式分解:x^2-y^2-x+y .谢谢啦!

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数学小问题.因式分解:x^2-y^2-x+y .谢谢啦!

数学小问题.因式分解:x^2-y^2-x+y .谢谢啦!
数学小问题.因式分解:x^2-y^2-x+y .谢谢啦!

数学小问题.因式分解:x^2-y^2-x+y .谢谢啦!
原式=(x+y)(x-y)-(x-y)
=(x+y-1)(x-y)

(x+y)(x-y-1)

x^2-y^2-x+y=(x+y)*(x-y)-(x-y)=(x-y)*(x+y-1)

x=2-y=2-x+y? 题目打清楚

(X+Y)(X-Y)-(X-Y)=(X-Y)(X+Y-1)

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