（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)x/(x^2-y^2)-y/(x^2+2xy+y^2)

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（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)x/(x^2-y^2)-y/(x^2+2xy+y^2)（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)x/(x^2-y^2)-y

（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)x/(x^2-y^2)-y/(x^2+2xy+y^2)
（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)
x/(x^2-y^2)-y/(x^2+2xy+y^2)

（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)x/(x^2-y^2)-y/(x^2+2xy+y^2)
（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)
=（a^2-b^2)/ab-b(a-b)/a(b-a)
=（a^2-b^2)/ab-(-b)/a
=（a^2-b^2)/ab+b/a
=（a^2-b^2)/ab+b^2/ab
=（a^2-b^2+b^2)/ab
=a^2/ab
=a/b
x/(x^2-y^2)-y/(x^2+2xy+y^2)
=x/[(x+y)(x-y)]-y/(x+y)^2
=x(x+y)/[(x+y)^2(x-y)]-y(x-y)/[(x+y)^2(x-y)]
=(x^2+xy-yx+y^2)/[(x+y)^2(x-y)]
=(x^2+y^2)/[(x+y)^2(x-y)]
这个不会看不懂吧

（a^2-b^2)/ab-(ab-b^2)/(ab-a^2)
=a/b-b/a-[b(a-b)]/[a(b-a)] 提取公因式并化简
=a/b-b/a+b/a=a/b
x/(x^2-y^2)-y/(x^2+2xy+y^2)
=[x(x+y)-y(x-y)]/[(x+y)(x+y)(x-y)] 通分
=(x^2+y^2)/[(x+y)^2(x-y)]

a+b/2ab 2AB/A+B a+b/2ab b/(a^2-ab)+c/(b^2-ab)+(a+b^2)/(a^2b-ab^2) （a+ab)-[(ab-2b)-a]-(-9ab),其中a+b=-7,ab=3. a^2-3ab+b^2/ab=( )/ab-3 a^2-3ab+b^2/ab=( )/ab -3 （a-b）^2/ab-(a^2-b^2)/ab (a+b-2ab)(a+b-2)+(1-ab)^2 (a-b)平方-2ab(b-a) (a-b)^3+2ab(a-b) [(a^2-2ab)/-ab+b^2]/[(a/a+b)/(2ab/2b-a)] a>2,b>2ab a^2b-ab+2ab^2-5a^b-4ab+3ab^2化简快 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? -ab(a^2b^5-ab^3-b) 计算：2ab[(2ab)²-3b(ab+a²b)-ab²]