计算a-1/a²-6a+9÷a²-1/a²-9

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计算a-1/a²-6a+9÷a²-1/a²-9

计算a-1/a²-6a+9÷a²-1/a²-9
计算a-1/a²-6a+9÷a²-1/a²-9

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)