[(3/a+1)-a+1]除以(a^2-4a+4)/(a+1)

问题描述:

[(3/a+1)-a+1]除以(a^2-4a+4)/(a+1)

原式=[3-(a+1)(a-1)]/(a+1)×(a+1)/(a²-4a+4)
=(3-a²+1)/(a²-4a+4)
=-(a+2)(a-2)/(a-2)²
=-(a+2)/(a-2)