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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)
人气:247 ℃ 时间:2020-05-24 16:42:56
解答
(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/bx/(x^2-y^2)-y/(x^2+2xy+y^2)=x/[(x+y)(x-y)]-y/(x+y)^2...
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