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[a+2/a(a-2)]-[ 8/（a+2）(a-2)]
=(a+2)(a+2)/a(a-2)(a+2)-8a/a(a-2)(a+2)
=[(a²+4a+4)-8a]/a(a-2)(a+2)
=(a²-4a+4)/a(a-2)(a+2)
=(a-2)²/a(a-2)(a+2)
=(a-2)/a(a+2)
=(a+2)(a+2)/a(a-2)(a+2)-8a/a(a-2)(a+2)
=[(a²+4a+4)-8a]/a(a-2)(a+2)
=(a²-4a+4)/a(a-2)(a+2)
=(a-2)²/a(a-2)(a+2)
=(a-2)/a(a+2)
1年前
6
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