试题：
快速计算．
2
9
×3=
3
4
×12=
5
18
×6=		3×
5
6
=		4×
3
10
=
20×
3
10
=		4×
7
12
=		3×
4
15
=		100×
1
25
=		50×
7
10
=
7
11
×33=		24×
8
15
=		35×
3
28
=		10×
3
5
=		12×
1
6
=
7×
1
14
=
2
5
×200=		0×
4
11
=
11
48
×36=
21
25
×15=
4×
2
11
=		26×
2
13
=		4
1
2
×1=
3
4
×
3
4
=
3
4
×
1
2
=
3
8
×
5
6
=
分数乘法的意义和分数乘法的计算法则 2016-05-21

答案：

我来补答
2
9
×3=
2
3
3
4
×12=9
5
18
×6=
5
3
3×
5
6
=
5
2
4×
3
10
=
6
5
20×
3
10
=6		4×
7
12
=
7
3
3×
4
15
=
4
5
100×
1
25
=4		50×
7
10
=35
7
11
×33=21		24×
8
15
=
64
5
35×
3
28
=
15
4
10×
3
5
=6		12×
1
6
=2
7×
1
14
=
1
2
2
5
×200=80		0×
4
11
=0
11
48
×36=
33
4
21
25
×15=
63
5
4×
2
11
=
8
11
26×
2
13
=4		4
1
2
×1=4
1
2
3
4
×
3
4
=
9
16
3
4
×
1
2
=
3
8
3
8
×
5
6
=
5
16
 
 
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