m>-2,m

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m>-2,m
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m>-2,m
m>-2,m<-1,化简lm=2l-l1-ml

m>-2,m
因为m>-2,m<-1
所以m+2>0
1-m<0
lm+2l-l1-ml
=m+2-(1-m)
=m+2-1+m
=2m+1
祝学习进步,望采纳~~

lm+2l-l1-ml
=m+2-(1-m)
=m+2-1+m
=2m+1

m=2? 题出错了吧

|M-2|-|1-m|=-m+2-1+m=1