A.9+3 | B.9+9+9 | C.9×3 |
× | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
7 | 7 | ________ | ________ | ________ | ________ | ________ | ________ | ________ | ________ |
8 | ________ | ________ | 24 | ________ | ________ | ________ | ________ | ________ | ________ |
9 | ________ | ________ | ________ | ________ | 45 | ________ | ________ | ________ | ________ |
A.8×9 | B.8+9 | C.9+8 | D.9–8 |