Question

x-1分之x的平方-x+1等于多少？

Answer 1

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