已知x+3小于0,化简|x|-|x+3|
问题描述:
已知x+3小于0,化简|x|-|x+3|
答
x+3x|x|-|x+3|
=-x+(x+3)
=3
已知x+3小于0,化简|x|-|x+3|
x+3x|x|-|x+3|
=-x+(x+3)
=3