
(a方-4/a方-4a+4+2-a/a+2)÷a/a-2咋算
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(a方-4/a方-4a+4+2-a/a+2)÷a/a-2
=[(a²-4)/(a²-4a+4)+(2-a)/(a+2)]÷a/(a-2)
=[(a-2)(a+2)/(a-2)²+(2-a)/(a+2)]×(a-2)/a
=[(a+2)/(a-2)-(a-2)/(a+2)]×(a-2)/a
=[(a+2)²-(a-2)²]×(a-2)/a(a-2)(a+2)
=(a²+4a+4-a²+4a-4)/a(a+2)
=8a/a(a+2)
=8/(a+2)
=[(a²-4)/(a²-4a+4)+(2-a)/(a+2)]÷a/(a-2)
=[(a-2)(a+2)/(a-2)²+(2-a)/(a+2)]×(a-2)/a
=[(a+2)/(a-2)-(a-2)/(a+2)]×(a-2)/a
=[(a+2)²-(a-2)²]×(a-2)/a(a-2)(a+2)
=(a²+4a+4-a²+4a-4)/a(a+2)
=8a/a(a+2)
=8/(a+2)
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