1/x^2-2x+2dx为什么等于1/(x-1)^2+1d(x-1)

问题描述:

1/x^2-2x+2dx为什么等于1/(x-1)^2+1d(x-1)

因为
x²-2x+2
=x²-2x+1+1
=(x-1)²+1
且dx=d(x-1)