Tính nhẩm:
| 14 − 9 = ..... | 16 − 7 = ..... | 12 − 8 = ..... | 6 + 9 = ..... |
| 8 + 8 = ..... | 11 − 5 = ..... | 13 − 6 = ..... | 18 − 9 = ..... |
| 14 − 6 = ..... | 17 − 8 = ..... | 12 − 5 = ..... | 3 + 9 = ..... |
| 9 + 4 = ..... | 11 − 9 = ..... | 3 + 8 = ..... | 16 − 8 = ..... |
tình nhanh
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
Tính nhanh:
2+4+6+8+10+12+14+16+18=???
1+3+5+7+9+11+13+15+17=???
1 + 1 =
2 + 2 =
3 + 3 =
4 + 4 =
5 |+ 5 =
6 + 6 =
7 + 7 =
8 + 8 =
9 + 9 =
10 + 10 =
11 + 11 =
12 + 12 =
13 + 13 =
14 + 14 =
15 + 15 =
16 + 16 =
17 + 17 =
18 + 18 =
19 + 19 =
20 + 20 = ????cac ban giup mik nha nho k mik mik se tik cho!!!
Tính nhanh
10+11+12+13+14+16+17+18+19+20
1+2+3+4+5+6+7+8+9
Help help me giúp cần gấp
Tính nhẩm:
18 − 9 = ..... 17 − 9 = .....
16 − 9 = ..... 15 − 6 = .....
15 − 7 = ..... 15 − 8 = .....
11 − 7 = ..... 12 − 8 = .....
13 − 9 = ..... 11 − 6 = .....
14 − 6 = ..... 11 − 3 = .....
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=
