(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/(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]