b
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/07 16:07:50
b
b
b
由b<c<0<a,
|a-b|+|c-a|+|c-b|
=a-b+a-c+c-b
=2a-2b.
b
c-a<0, /c-a/=a-c
c-b>0, /c-b/ =c-b
/a-b/+/c-a/+/c-b/
=a-b+a-c+c-b
=2a-2b
原式=a-b+a-c+c-b
=2a-2b
b
b
b
由b<c<0<a,
|a-b|+|c-a|+|c-b|
=a-b+a-c+c-b
=2a-2b.
b
c-a<0, /c-a/=a-c
c-b>0, /c-b/ =c-b
/a-b/+/c-a/+/c-b/
=a-b+a-c+c-b
=2a-2b
原式=a-b+a-c+c-b
=2a-2b