约分与通分
问题描述：
约分与通分
约分：
ac/2bc
xy^2/(x+y)y
(x+y)^2/x^2+xy
(x-y)^2/x^2-y^2
通分：
ab/x与bc/y
bd/2c与4b^2/3ac
a(x+2)/x与b(x+2)/y
(x+y)^2/2xy与x^2-y^2/x
答
a/2b
xy/(x+y)
(x+y)/x
(x-y)/(x+y)
aby/xy bcx/xy
3abd/6ac 8d^2/6ac
ay(x+2)/xy bx(x+2)/xy
(x+y)^2/2xy 2y(x^2-y^2)/2xy1.5x2.1/3b+2c3.1/3a+b4.2/x-6通分1.9y/3x与2y^2/3x2.a^b/6c与18ab^2/6c3.2x^y+2xy^2/（x-y)xy与(x+y)^2(x-y)/xy(x-y)4.(2m+3）(2m-3)^2/2mn(2m-3)与4m^2n+6mn/(2m-3）2mn