通分.(1)x/4y与3x/2y;(2)x-1/x^2+x与x/x^2-x;(3)2xy/(x+y)^2与x/x^2-y^2;(4)1/2y-2与1/y+1.

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通分.(1)x/4y与3x/2y;(2)x-1/x^2+x与x/x^2-x;(3)2xy/(x+y)^2与x/x^2-y^2;(4)1/2y-2与1/y+1.通分.(1)x/4y与3x/2y;(2)x

通分.(1)x/4y与3x/2y;(2)x-1/x^2+x与x/x^2-x;(3)2xy/(x+y)^2与x/x^2-y^2;(4)1/2y-2与1/y+1.
通分.(1)x/4y与3x/2y;
(2)x-1/x^2+x与x/x^2-x;
(3)2xy/(x+y)^2与x/x^2-y^2;
(4)1/2y-2与1/y+1.

通分.(1)x/4y与3x/2y;(2)x-1/x^2+x与x/x^2-x;(3)2xy/(x+y)^2与x/x^2-y^2;(4)1/2y-2与1/y+1.
1)x/4y与6x/4y
2)(x-1)^2/x(x+1)(x-1)与x(x+1)/x(x+1)(x-1)
3)2xy(x-y)/(x+y)^2(x-y)与x(x+y)/(x+y)^2(x-y)
4)y+1/(2y-2)(y+1)与(2y-2)/(2y-2)(y+1)