计算下面各题. (÷3﹣)×; ÷[×(+)]; (+)÷+; 0.5÷[10.6÷(4.5+0.8)].
234+123-235= 234+321-136=
11+5+1= 12+7-1=
12-3-5= 19-2-4= 15-7-4= 18-6-8= 17-6-9= 19-9-8
16-1+2= 17-2+4= 8+9-7= 17-9+2= 12+3-7= 14+6-2= 10+4-8= 10-7+1=
9-3+1= 16-7+4=13-3+9= 19-3+1= 14-1+5= 8-4+12=