a-b/a^2+ab / ab-a^2/a^2b^2-b^4快

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a-b/a^2+ab / ab-a^2/a^2b^2-b^4快
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a-b/a^2+ab / ab-a^2/a^2b^2-b^4快
a-b/a^2+ab / ab-a^2/a^2b^2-b^4
快

a-b/a^2+ab / ab-a^2/a^2b^2-b^4快
原式=(a-b)/a(a+b)÷[-a(a-b)/b^2(a+b)(a-b)]
=-(a-b)/a(a+b)×[b^2(a+b)(a-b)/a(a-b)]
=-(a-b)/a(a+b)×[b^2(a+b)/a]
=-b^2(a-b)/a^2

(a-b)/(a^2+ab) ÷ (ab-a^2)/(a^2b^2-b^4)
= (a-b) / (a^2+ab) × (a^2b^2-b^4) / (ab-a^2)
= (a-b) / {a(a+b) × b^2(a+b)(a-b) / {-a(a-b)}
= (a-b) /a × b^2 / {-a}
= -b^2(a-b)/a^2

=(a-b)/a(a+b)÷[-a(a-b)/b^2(a+b)(a-b)]=-(a-b)/a(a+b)×[b^2(a+b)(a-b)/a(a-b)]=-(a-b)/a(a+b)×[b^2(a+b)/a]=-b^2(a-b)/a^2

a+b/2ab 2AB/A+B a+b/2ab 因式分解：a×a×a-2a×a×b+ab×b （a+ab)-[(ab-2b)-a]-(-9ab),其中a+b=-7,ab=3. [(a^2-2ab)/-ab+b^2]/[(a/a+b)/(2ab/2b-a)] (a-b)平方-2ab(b-a) (a-b)^3+2ab(a-b) b/(a^2-ab)+c/(b^2-ab)+(a+b^2)/(a^2b-ab^2) （a-b）^2/ab-(a^2-b^2)/ab (a+b-2ab)(a+b-2)+(1-ab)^2 a>2,b>2ab a-b/a除以(a-2ab-b^2/a) b/a^2-ab,a/b^2-ab,ab/a^2-b^2通分 ab/a+b=3 a-2ab+b/2a-3ab+2b? a^2-3ab+b^2/ab=( )/ab-3 a^2-3ab+b^2/ab=( )/ab -3 a^2b-ab+2ab^2-5a^b-4ab+3ab^2化简快