Question

计算（x-1分之3-x-1）÷x的平方-2x+1分之x-2

详细一点，我搞不懂

Answer 1

[(3-x)/(x-1)-1]/[(x-2)/(x^2-2x+1)]
=[(3-x-x+1)/(x-1)]*[(x^2-2x+1)/(x-2)}
=[(-2x+4)/(x-1)]*[(x^2-2x+1)/(x-2)]
=2-2x
最后一步相乘互相约掉了。