计算：(x-2分之x-2+x分之x)÷2-x分之4x 快,
问题描述：
计算：(x-2分之x-2+x分之x)÷2-x分之4x 快,
答
[x/(x-2)-x/(2+x)]/[4x /(2-x)]
=[x(x-2-2-x)]/[4x /(2-x)]
=-4x/[4x /(2-x)]
=-(2-x)
=x-2可是我的答案是x+2分之x-3诶对不起，看错符号了。[x/(x-2)-x/(2+x)]/[4x /(2-x)]=[x(x+2)-x(x-2)]/[(x+2)(x-2)]/[4x /(2-x)]=4x(2-x)/[4x(x+2)(x-2)]=1/(x+2)