直接寫出得數(shù).
4
13
×39
=
5
6
-
1
2
=
7
18
=
21÷
7
9
=
2÷3=
20
39
×
13
15
=
7
10
÷
14
15
=
1
8
+
1
12
=
分析:本題根據(jù)分數(shù)乘法、除法、加法、減法的運算法則計算即可.
解答:解:
4
13
×39
=12,
5
6
-
1
2
=
1
3
,
7
18
=
7
3
21÷
7
9
=27,
2÷3=
2
3
,
20
39
×
13
15
=
4
9
,
7
10
÷
14
15
=
3
4
,
1
8
+
1
12
=
5
24
點評:完成有關(guān)于分數(shù)的計算時要細心,注意通分約分,結(jié)果化為最簡分數(shù).
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