(x/x-2 -x/x十2)/4x/2-x

分类: 作业答案 • 2022-07-19 15:32:50

问题描述：

答

[(x/(x-2)-x/(x+2)]/[4x/(2-x)]
=x[1/(x-2)-1/(x+2)]*(2-x)/4x
=(2-x)[(x+2-x+2)/(x+2)(x-2)]/4
=-(x-2)*4/[4(x+2)(x-2)]
=-1/(x+2)