|x+1|-|x-3|

来源：学生作业帮助网编辑：作业帮时间：2024/04/30 11:28:52

|x+1|-|x-3|
|x+1|-|x-3|

|x+1|-|x-3|
令x-3=y
|y+4|-|y|则 a>4

当x<-1时，原式=-（x+1）+(x-3)=-4-4;
当-1<=x<=3时，原式=x+1+(x-3)=2x-2 2x-2的取值范围为[-4,4]4;
当x>3时，原式=-x+1-(x-3)=44
对a的取值范围取交集得a>4

|x+1|-|x-3|1.x》3，x+1-x+34
2,-12(x-1) ,-4<2(x-1)<4 ,a>-4
3,x《-1， -(x+1-x+3)-4
a的范围是 a>4

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