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原式=a/(a-2)-(a+2)/a(a-2)+1/a
=[a²-(a+2)+(a-2)]/a(a-2)
=(a²-a-2+a-2)/a(a-2)
=(a+2)(a-2)/a(a-2)
=(a+2)/a
=102/100
=1.02
=[a²-(a+2)+(a-2)]/a(a-2)
=(a²-a-2+a-2)/a(a-2)
=(a+2)(a-2)/a(a-2)
=(a+2)/a
=102/100
=1.02
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