整数乘法运算定律推广到小?/p>
一、口算?/p>
2.4
×
5
?/p>
100
?/p>
23.56
?/p>
1.5
×
0.4
?/p>
0.8
×
50
?/p>
0.25
×
4
?/p>
8
×
12.5
?/p>
1
?/p>
0.48
?/p>
2.65
×
1
?/p>
0.2
×
500
?/p>
0.125
×
8
?/p>
2.5
×
40
?/p>
32
×
25
?/p>
12
×
16
?/p>
8
×
16
?/p>
0.125
×
0.8
×
4
?/p>
0.2
×
5
?/p>
0.5
?/p>
50
×
0.32
×
0.2
?/p>
9.8
×
7
?/p>
3
×
9.8
?/p>
二、运用运算定律填空?/p>
0.4
×
2.1
=(
)○
0.4 0.125
×
1.3
×
0.8
?/p>
(____
×
____)
×
____
(12.3
×
4)
×
2.5
?/p>
____
?/p>
(____
×
2.5) 2.3
×
(100
?/p>
2)
?/p>
____
×
____
?/p>
____
×
____
(8
?/p>
0.4)
×
25
=(
)?/p>
25
+(
)?/p>
25
9.8
×
124
?/p>
(
?/p>
)
×
124
=(
)×(
)-?/p>
)×(
?/p>
(7.5
?/p>
1.25)
×
0.8
?/p>
____
×
____
?/p>
____
×
____
3.26
×
102
?/p>
3.26
×
(____
?/p>
____)
?/p>
3.26
×
____
?/p>
3.26
×
____
4.3
×
9.8
?/p>
4.3
×
(____
?/p>
____)
?/p>
4.3
×
____
?/p>
4.3
×
____
30.8
×
10.1
?/p>
30.8
×
(____
?/p>
____)
?/p>
30.8
×
____
?/p>
30.8
×
____
三、简便计算?/p>
0.125
×
64 0.68
×
101 3.26
×
5.7
?/p>
3.26
×
0.7
55.6
×
99
?/p>
55.6 1.25
×
213
×
0.8 19.625
?/p>
(4.379
?/p>
9.625)
3.42
×
5.7
?/p>
4.3
×
3.42 8.75
×
11
?/p>
8.75 9.9
×
212 9.54
×
101
1.25
×
4.8
×
0.08 2.6
×
4.3
?/p>
5.7
×
2.6 3.64
×
0.8
?/p>
6.36
×
0.8
?/p>
3.8