1.6×0.5=
0.8+2.2=
23=
+ =
× =
16÷ =
1.02﹣0.53=
=
3.6÷0.1=
3.14×4=
40×25%=
1﹣0.14=
3.4÷0.17=
0.92=
625+375=
图形
……
射线条数
2
3
4
5
组成角的个数
1
6
10