计算a+5/5a-20+5/a²-8a+16

问题描述:

计算a+5/5a-20+5/a²-8a+16

a+5/5a-20+5/a²-8a+16
=(a+5)/5(a-4) +5/(a-4)²
=[(a+5)(a-4)+25]/5(a-4)²
=[a²-4a+5a-20+25]/5(a-4)²
=(a²+a+5)/5(a-4)²