a,b小于0.c大于0.小于1.化简|a+b|-|b-1|-|a-c|-|1-c|

a,b小于0.c大于0.小于1.化简|a+b|-|b-1|-|a-c|-|1-c|
a,b小于0.c大于0.小于1.化简|a+b|-|b-1|-|a-c|-|1-c|

a,b小于0.c大于0.小于1.化简|a+b|-|b-1|-|a-c|-|1-c|
a＜0,b＜0,c＞0,c＜1
|a+b|-|b-1|-|a-c|-|1-c|
=-(a+b)-(1-b)-(c-a)-(1-c)
=-a-b-1+b-c+a-1+c
=-2

因为:a,b小于0,所以:
|a+b|=-a-b,
|b-1|=-(b-1)=-b+1
因为:c大于0.小于1,所以:
|a-c|=-(a-c)=-a+c
|1-c|=1-c
|a+b|-|b-1|-|a-c|-|1-c|=
(-a-b)-(-b+1)-(-a+c)-(1-c)=
-a-b+b-1+a-c-1+c=-2