(a^2-2ab)/(-ab+b^2)÷[a^2/(a-b)÷(2ab)/(2b-a)]
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(a^2-2ab)/(-ab+b^2)÷[a^2/(a-b)÷(2ab)/(2b-a)](a^2-2ab)/(-ab+b^2)÷[a^2/(a-b)÷(2ab)/(2b-a)](a^2-2ab)/(-
(a^2-2ab)/(-ab+b^2)÷[a^2/(a-b)÷(2ab)/(2b-a)]
(a^2-2ab)/(-ab+b^2)÷[a^2/(a-b)÷(2ab)/(2b-a)]
(a^2-2ab)/(-ab+b^2)÷[a^2/(a-b)÷(2ab)/(2b-a)]
=a(a-2b)/[-b(a-b)] ×(a-b)/a² ×2ab/[-(a-2b)]
=2
a+b/2ab
2AB/A+B
a+b/2ab
-5a(a^2b-ab^2)÷ab
计算：a2-2ab/-ab+b2÷(a2/a-b÷2ab/2b-a)
a^2-3ab+b^2/ab=( )/ab-3
a^2-3ab+b^2/ab=( )/ab -3
（a+ab)-[(ab-2b)-a]-(-9ab),其中a+b=-7,ab=3.
(-a^2b^2)÷(-ab^2)×(-3ab^3)
(-a^2b^2)÷(-ab^2)*(-3ab^3)
a^2b-ab+2ab^2-5a^b-4ab+3ab^2化简快
(a^2b-ab-a+1)/(ab^2+3ab-b-3)÷(a^2+a_2)/(b^2+b-6)
(ab(a^-2ab)-a^2b(a-3b))÷（3a^b）
(a^2-2ab)/(-ab+b^2)÷[a^2/(a-b)÷(2ab)/(2b-a)]
b/(a^2-ab)+c/(b^2-ab)+(a+b^2)/(a^2b-ab^2)
[(a^2-2ab)/-ab+b^2]/[(a/a+b)/(2ab/2b-a)]
（a-b）^2/ab-(a^2-b^2)/ab
(a+b-2ab)(a+b-2)+(1-ab)^2