a方+a/a方-1 8a方+16a+8/4a+4

题目

a方+a/a方-1 8a方+16a+8/4a+4

答案

(a²+a)/(a²-1)
=a(a+1)/(a+1)(a-1)
=a/(a-1)
(8a²+16a+8)/(4a+4)
=8(a+1)²/4(a+1)
=2(a+1)