已知-1

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已知-1

-10
|x+1|=x+1
x

-1|x+1 |=x+1
|x-2| =2-x
|3-x |=3-x
|4-2x | =4-2x
|x+1 |+ |x-2 |- |3-x |+ |4-2x |
=x+1+2-x-3+x+4-2x
=4-x

4-x