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原式=(a-2)/(a-5)÷[16/(a-3)-(a+3)] =(a-3)/(a-5)÷[16-(a+3)(a-3)]/(a-3) =(a-3)/(a-5)×(a-3)/(25-a²) =-(3-a)/(a-5)×(a-3)/(5+a)(5-a)
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