分式通分~.通分：a-b a+b分之a²+ab通分：a-b a+b分之a²+ab

问题补充：

分式通分~.通分：a-b,a+b分之a²+ab通分：a-b,a+b分之a²+ab x(x+y)分之x-y,y(x-y)分之x+ya分之1,4a²b分之1,6ab²c分之1x分之y,y分之x,x+y分之xy.分式通分··我数学太差了.叔叔阿姨哥哥姐姐们~

答案：

(a²+ab)/(a+b)

a-b=(a-b)(a+b)/(a+b)

(x-y)/[x(x+y)]

=y(x-y)²/[xy(x+y)(x-y)]

(x+y)/[y(x-y)]=x(x+y)²/[xy(x+y)(x-y)]

1/a=12ab²c/(12a²b²c)

1/(4a²b)=3bc/(12a²b²c)

1/(6ab²c)=2a/(12a²b²c)

x分之y,y分之x,x+y分之xy

y/x=y²(x+y)/[xy(x+y)]

x/y=x²(x+y)/[xy(x+y)]

xy/(x+y)=x²y²/[xy(x+y)]