數學教教我(10分)Thx~~~~~~小數乘法)

1. 66.82x42=
66.82
x 42
----------------
2672.80
133.64
-----------------
2806.44
=======

2. 89.4x100=
89.4
x 100
----------------
8940.0
=========
3. 26.4x23=
26.4
x 23
----------------
528.0
+ 79.2
-----------------
607.2
=========


4. 125.26x10=
125.26
x 10
----------------
1252.60
=========

5. 72.17x100=
72.17
x 100
----------------
7217.00
=========
6. 22x2.84=
2.84
x 22
----------------
56.80
+ 5.68
-----------------
62.48
======

7. 2.25x15=
2.25
x 15
----------------
22.50
+ 11.25
-----------------
33.75
======



8. 0.36x8=
0.36
x 8
----------------
2.88
======

9. 1.25x26=
1.25
x 26
----------------
25.00
+ 7.50
-----------------
32.50
======

10. 30.5x100=

30.50
x 100
----------------
3050.00
=========

11. 31.4x31=
31.4
x 31
----------------
942.00
+ 31.40
-----------------
972.40
======

12. 6.83x27=
6.83
x 27
----------------
136.60
+ 47.81
-----------------
184.41
======


13 7.4x25=
7.40
x 25
----------------
148.00
+ 37.00
-----------------
185.00
======
14. 23.42x30=
23.42
x 30
----------------
702.60
======

15. 18.53x10=
18.52
x 10
----------------
185.20
======


16. 64.21x100=

64.21
x 100
----------------
6421.00
======


17. 0.19x29=
0.19
x 29
----------------
3.80
+ 1.71
--------------
5.51
======

18. 100x2.5=
2.5
x 100
----------------
250.00
======
19. 100x2.5=
2.5
x 100
----------------
250.00
======

20. 17.5x10=
17.5
x 10
----------------
175.0
======

冇過程喎,呢啲數 1.2806.44 2.8940 3.607.2 4.1252.6 5.7217 6.62.48 7.33.75 8.2.88 9.32.5 10.93025 11.973.4 12.184.41 13.185 14.702.6 15.185.3 16.6421 17.5.51 18.250 19.250 20.175

1. 66.82x42=2806.44
2. 89.4x100=8940
3. 26.4x23=607.2
4. 125.26x10=1252.6
5. 72.17x100=7217
6. 22x2.84=62.48
7. 2.25x15=33.75

8. 0.36x8=2.88
9. 1.25x26=32.5
10. 30.5x100=3050



11. 31.4x31=973.4
12. 6.83x27=184.41
13 7.4x25=185
14. 23.42x30=702.6
15. 18.53x10=185.3
16. 64.21x100=6421




17. 0.19x29=5.51
18. 100x2.5=250
19. 100x2.5=250
20. 17.5x10=175

用計數機.