作业帮1、(x-1分之x²)-x-1（因式分解）；2、x²(x-y)²-4(y-x)²（因式分解）3、a分之a+1×(a+1分之2a)²-[(a-1分之1)-(a+1分之1)]
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![1、(x-1分之x²)-x-1（因式分解）；2、x²(x-y)²-4(y-x)²（因式分解）3、a分之a+1×(a+1分之2a)²-[(a-1分之1)-(a+1分之1)]](/uploads/image/z/431130-66-0.jpg?t=1%E3%80%81%28x-1%E5%88%86%E4%B9%8Bx%26%23178%3B%29-x-1%EF%BC%88%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%89%EF%BC%9B2%E3%80%81x%26%23178%3B%28x-y%29%26%23178%3B-4%28y-x%29%26%23178%3B%EF%BC%88%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%893%E3%80%81a%E5%88%86%E4%B9%8Ba%2B1%C3%97%28a%2B1%E5%88%86%E4%B9%8B2a%29%26%23178%3B-%5B%28a-1%E5%88%86%E4%B9%8B1%29-%28a%2B1%E5%88%86%E4%B9%8B1%29%5D)
1、(x-1分之x²)-x-1（因式分解）；2、x²(x-y)²-4(y-x)²（因式分解）3、a分之a+1×(a+1分之2a)²-[(a-1分之1)-(a+1分之1)]
1、(x-1分之x²)-x-1（因式分解）；2、x²(x-y)²-4(y-x)²（因式分解）
3、a分之a+1×(a+1分之2a)²-[(a-1分之1)-(a+1分之1)]
1、(x-1分之x²)-x-1（因式分解）；2、x²(x-y)²-4(y-x)²（因式分解）3、a分之a+1×(a+1分之2a)²-[(a-1分之1)-(a+1分之1)]
1、x²/(x-1) -(x+1)(x-1)/(x-1)
=[x²-(x+1)(x-1)]/(x-1)
=1/(x-1)
2、=x²(x-y)-4(x-y)²
=(x-y)²(x²-4）
=(x-y)²(x+2)(x-2)
3、=(a+1)/a× 4a²/(a+1)²-1/(a-1)+1/(a+1)
=4a/(a+1)+1/(a+1)-1/(a-1)
=(4a+1)/(a+1) -1/(a-1)
=[(4a+1)(a-1)-(a+1)]/(a+1)(a-1)
=(4a²-4a-2)/(a²-1)
x-1=x-1分之（x-1）²
（x-1）²=x²-2x+1
x²-x²+2x-1
原式=x-1分之2x-1
（y-x）²=（x-y）²
原式=（x-2）（x+2）（x-y）²