口算题
1. 10-7= 12-7=
14-7= 16-7=
11-7= 13-7=
15-7= 17-7=
2. 9+6= 17-8=
15-9= 14-8=
12-7= 14-9=
7+4= 17-9=
16-8= 15-7=
16-7= 14-7=
5+9= 13-7=
15-8= 17-7=
3.15-7+4= 12-7-3=
4+9-7= 10+5-7=
16-8+3= 15-7-3=
14-7-7= 12+1-7=