a) 135 - 13 - 22 + 50
= 135-(13+22)-50
= 135- 35 + 50
= 100 -50
= 50
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hãy tính nhanh:
A.1+2+3+4+5+6+7+8+9+10+11+12+13-14=?
B.30-29+28-27+26-25+24-23+22-21...+12-11+10-9+8-7+6-5+4-3+2-1=?
Tính nhanh:
2+4+6+8+10+12+14+16+18=???
1+3+5+7+9+11+13+15+17=???
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26
Tính nhanh:
a) 5 – 4 – 3 – 2 – 1 + 11 + 12 + 13 + 14 + 15
b) 1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + 9 – 10 +11
Tính nhanh:
a) 5 – 4 – 3 – 2 – 1 + 11 + 12 + 13 + 14 + 15
b) 1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + 9 – 10 +11
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 .....
Đọc tiếp
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 = ..... |
28+27+26+25+24+23+22+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1+=....................................................?
tình nhanh
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
tinh nhanh bang 2 cach:
a) 3-5+7-9+11-13+15
b) 4-6+8-10+12-14+16