3
5
15
20
18
12
9+8=
11-9=
6+5=
15-8=
8+7=
13-6=
7+3=
14-7=
18-( )=9
( )-5=8
6+( )=14
7+( )=13
1910
2018
1516
9+68+7
18-518
16-314
9+77+9
1020
+8<15
4+<11
8+<12
3+<13
+7<16
+2<14
□-□=□
□+□=□
10+2=□ 12-□=□
□○□=□(朵)
□○□=□(个)
□○□=□(面)