一.化简(a-b)/(a²+ab) ÷(ab-a²)/(a²b²-a^4)PS:
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(a-b)/(a²+ab) ÷(ab-a²)/(a²b²-a^4)
=(a-b)/a(a+b) *a²(b+a)(b-a)/a(b-a)
=(a-b)/(a+b)*(b+a)
=a-
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