如果x/x-y=a,则分式2x^2y-2xy^2/3x^2y
问题描述:
如果x/x-y=a,则分式2x^2y-2xy^2/3x^2y
等于多少?要过程..
答
x/(x-y)=a
(2x^2y-2xy^2)/3x^2y
=2xy(x-y)/3x^2y
=2(x-y)/3x
=2/3*1/a
=2/(3a)