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
原式=a-1/(a-3)^2*(a-3)(a+3/(a-1)(a+1)
=a+3/(a-3)(a+1)
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