计算a-1/a²-6a+9÷a²-1/a²-9

问题描述:

计算a-1/a²-6a+9÷a²-1/a²-9

a-1/a²-6a+9÷a²-1/a²-9
=a-1/(a-3)²÷(a+1)(a-1)/(a+3)(a-3)
=(a+3)/(a+1)(a-3)