58+7= 6+55= 36+20=
55+10= 49+6= 4+56=
列式计算:
口答:还剩( )个篮球。
11-2= 13-5= 15-7= 16-8=
14-6= 12-8= 18-10= 19-9=
9+5-7= 8+8-7= 17-10+5= 15-7-6=
87- 80= 96-90= 50+9= 16-8+6=
56-50= 98-8= 70+7= 90+9=
2+37=
87-24=
20+80=
13-9=
11-8=
42+16=
97-60=
50+3=
17-9-6=
14-9+3=
18-9-2=
12-9+5=
13-9-2=
19-9+3=
7+8-9=
11-9+6=