[(a+2分之a²-5a+2)+1]/(a²+4a+4分之a²-4)

问题描述:

[(a+2分之a²-5a+2)+1]/(a²+4a+4分之a²-4)

=(a²-5a+2+a+2)/(a+2) ×(a+2)²/(a+2)(a-2)
=(a²-4a+4)/(a-2)
=(a-2)²/(a-2)
=a-2