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~
问题描述：
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+y
a分之1,4a²b分之1,6ab²c分之1
x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
(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)]