先化解分式a²-9/a²+6a+9÷a-3/a²+3a-a-a²/a-1

问题描述:

先化解分式a²-9/a²+6a+9÷a-3/a²+3a-a-a²/a-1

=(a+3)(a-3)/(a+3)²×a(a+3)/(a-3)-(a-a²)/(a-1)
=a+a(a-1)/(a-1)
=2a