3(5x+2)+5＜4x-6(x+1)
15x+6+5<4x-6x-6
15x-4x+6x<-6-6-5
17x<-17
x<-1
x+1<0
1-x>0
则：
√（x+1）²-|1-x|
=|x+1|-|1-x|
=-(x+1)-(1-x)
=-x-1+x-1
=-2