直接寫得數(shù).
3
4
×8
=
5
7
×14
=
7
12
×3
=
2
9
×15
=
2
15
=
36×
5
9
=
24×
5
12
=
100×
13
25
=
7
8
×5
=
1
6
×4
=
7
12
=
15×
2
15
=
分析:分數(shù)乘整數(shù):分子與整數(shù)相乘的積做分子,分母不變,能約分的先約分.
解答:解:

3
4
×8
=6
5
7
×14
=10
7
12
×3
=
7
4
2
9
×15
=
10
3
2
15
=
2
3
36×
5
9
=20
24×
5
12
=10
100×
13
25
=52
7
8
×5
=
35
8
1
6
×4
=
2
3
7
12
=
21
4
15×
2
15
=2
點評:本題考查了簡單的分數(shù)乘法的計算,計算時要細心,注意把結(jié)果化成最簡分數(shù).
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