2x分之1- x+y分之1(2x分之x+y -x-y)化简

问题描述:

2x分之1- x+y分之1(2x分之x+y -x-y)化简

看不清也
(1-x)/2x-[1/(x+y)][(x+y)/2x-x-y]
=1/2x-1/2-[1/(x+y)][(x+y)/2x-(x+y)]
=1/2x-1/2-1/2x+1/2
=0