2x?a<1 ① x?2b>3 ② ,由①得:2x<a+1,∴x< a+1 2 ,由②得:x>2b+3,∵x的取值范围是-1<x<1,∴ a+1 2 =1,∴a=1,2b+3=-1,b=-2,∴(a+1)(b-1)=2×(-3)=-6.故答案为:-6.