a) Tính nhẩm: 0 + 7 = . . . . . 7 + 0 = . . . . . 0 × 7 = . . . . . 7 × 0 = . . . . . 6 + 1 = . . . . . 1 + 6 = . . . . . 1 × 6 = . . . . . 6 × 1 = . . . . . 5 – 0 = . . . . . 0 : 5 = . . . .
Giải thích
a) Tính nhẩm:
0 + 7 = 7 7 + 0 = 7 0 × 7 = 0 7 × 0 = 0 | 6 + 1 = 7 1 + 6 = 7 1 × 6 = 6 6 × 1 = 6 | 5 – 0 = 5 0 : 5 = 0 5 : 1 = 5 5 : 5 = 1 |
b) Số?
6 × 1 = 6 5 : 1 = 5 6 : 1 = 6 | 7 × 0 = 0 5 : 5 = 1 2 : 1 = 2 | 6 : 6 = 1 0 : 6 = 0 0 × 4 = 0 | 1 × 3 = 3 0 : 7 = 0 7 : 7 = 1 |