Question

分数乘法简便计算题

简便！

Answer 1

1．计算 1.135+3.346+5.557+7.768+9.979=_____.

2. 计算 1.996+19.97+199.8=_____.

3. 计算 9.8+99.8+999.8+9999.8+99999.8=_____.

4. 计算 6.11+9.22+8.33+7.44+5.55+4.56+3.67+2.78 +1.89=_____.

5. 计算 1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19=_ _.

6. 计算 2.89×4.68+4.68×6.11+4.68=_____.

7. 计算 17.48×37-17.48×19+17.48×82=_____.

8. 计算 1.25×0.32×2.5=_____.

9. 计算 75×4.7+15.9×25=_____.

10. 计算 28.67×67+32×28.67+573.4×0.05=_____.

二、解答题
11. 计算 172.4×6.2+2724×0.38

Answer 2

分数乘法简便计算题
1. 7 × 5/49 + 3/14
2. 6 ×( 1/2 + 2/3 )
3. 8 × 4/5 + 8 × 11/5
4. 31 × 5/6 – 5/6
5. 9/7 - ( 2/7 – 10/21 )
6. 5/9 × 18 – 14 × 2/7
7. 4/5 × 25/16 + 2/3 × 3/4
8. 14 × 8/7 – 5/6 × 12/15
9. 17/32 – 3/4 × 9/24
10. 3 × 2/9 + 1/3
11. 5/7 × 3/25 + 3/7
12. 3/14 ×× 2/3 + 1/6
13. 1/5 × 2/3 + 5/6
14. 9/22 + 1/11 ÷ 1/2
15. 5/3 × 11/5 + 4/3
16. 45 × 2/3 + 1/3 × 15
17. 7/19 + 12/19 × 5/6
18. 1/4 + 3/4 ÷ 2/3
19. 8/7 × 21/16 + 1/2
20. 101 × 1/5 – 1/5 × 21
21. 7/19 + 12/19 × 5/6
22. 1/4 + 3/4 ÷ 2/3
23. 8/7 × 21/16 + 1/2
24. 101 × 1/5 – 1/5 × 21
25.50+160/40
26.(58+370)÷(64-45)
27.120-144/18+35
28.47+45×2-4160÷52
29.3/7 × 49/9 - 4/3
30.8/9 × 15/36 + 1/27

Answer 3

7/25×4/9+7/25×5/9
=7/25×(4/9+5/9)
=7/25×1
=7/25

60×(1/12+1/15+1/4)
=60×1/12+60×1/15+60×1/4
=5+4+15
=24

(5/12-3/8)×72
=5/12×72-3/8×72
=30-27
=3

6/7-5/24÷7/12
=6/7-5/24×12/7
=12/14-5/14
=7/14
=1/2

[3/4×(7/16-1/4)]÷9/13
=3/4×（7/16-4/16）×13/9
=1/4×3/16×13/3
=13/64

2/3-7/8+1/3
=(2/3+1/3)-7/8
=1-7/8
=1/8

5/6-(3/7-1/6)
=(5/6+1/6)-3/7
=1-3/7
=4/7

1-1/3-2/3
=1-(1/3+2/3)
=1-1
=0

1+3/5-1/10
=1+6/10-1/10
=1+1/2
=1又1/2

3/8-12/13+5/8
=3/8+5/8-12/13
=1-12/13
=1/13

1-(1/2-3/4)
=1+3/4-2/4
=1+1/4
=5/4

1-1/2-1/4
=1/2-1/4
=2/4-1/4
=1/4

2/7-8/9+5/7
=(2/7+5/7)-8/9
=1-8/9
=1/9

2-1/4-3/4
=2-(1/4+3/4)
=2-1
=1

1/2-(3/8-1/2)
=1/2+1/2-3/4
=1-3/8
=5/8
3/4÷5/8×3/10
=3/4×8/5×3/10
=9/5×1/5
=9/25
1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5
2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8

3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7

Answer 4

5／2乘3／2加5／2乘3／1
这个很好算的

Answer 5

加减法，结合律 交换律
乘除法，结合律 交换律 分配律