约分与通分

题目

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

答案

1.5x 2.1/3b+2c 3.1/3a+b 4.2/x-6 通分 1.9y/3x与2y^2/3x 2.a^b/6c与18ab^2/6c 3.2x^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