直接寫得數(shù):
4
9
×
4
3
=
7
16
=
1
6
-
1
9
=
4
5
÷
5
4
=
2
3
×
4
7
÷
2
3
×
4
7
=
8
5
=
3
19
÷
1
5
=
21×
2
35
=
4
7
÷8=
6
7
÷
3
4
×
4
3
=
分析:分數(shù)乘法:分子相乘的積做分子,分母相乘的積做分母,能約分的先約分;
分數(shù)除法:除以一個數(shù)等于乘這個數(shù)的倒數(shù).
解答:
解:×
4
3
=
16
27
,
7
16
=0,
1
6
-
1
9
=
1
18
,
4
5
÷
5
4
=
16
25
2
3
×
4
7
÷
2
3
×
4
7
=
16
49
,
8
5
=
5
8
,
3
19
÷
1
5
=
15
19
,
21×
2
35
=
6
5
,
4
7
÷8=
1
14
,
6
7
÷
3
4
×
4
3
=
32
21
點評:本題考查了簡單的分數(shù)乘除法的計算,計算時要細心,注意把結果化成最簡分數(shù).
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