已知-3<m<2.化简|m-2|+|m+3|-|3m+9|-|2m-4|

问题描述:

已知-3<m<2.化简|m-2|+|m+3|-|3m+9|-|2m-4|

|m-2|+|m+3|-|3m+9|-|2m-4|
=(2-m)+(m+3)-(3m+9)-(4-2m)
=2-m+m+3-3m-9-4+2m
=-m-8