左右两边同时加上1得-2<2X≤4之后左右两边同时除以2得-1因为X属于Z 而-1所以B ={0,1,2}
-3+1<2x≤3+1-2÷2-1x=0,x=1,x=2
-3<2x-1<=3-2<2x<=4-1
B={0,1,2}
1X=2
