题目内容

5
8
×
8
9
=
1
2
÷6=
5
4
÷
1
4
=
1
2
=
3
4
×
8
5
=
1
6
-
1
7
=
1
3
+
1
2
=
4
5
=
1
20
=
1
20
×
4
5
=
1
2
×
1
3
+
1
2
=
1-
1
2
+
3
5
=
分析:分数乘法:分子相乘的积做分子,分母相乘的积做分母;
分数除法:除以一个数等于乘这个数的倒数.
解答:解:
5
8
×
8
9
=
5
9
1
2
÷6=
1
12
5
4
÷
1
4
=5,
1
2
=2,
3
4
×
8
5
=
6
5
1
6
-
1
7
=
1
42
1
3
+
1
2
=
5
6
4
5
=
15
2
1
20
=0,
1
20
×
4
5
=
1
25
1
2
×
1
3
+
1
2
=
2
3
1-
1
2
+
3
5
=
11
10
点评:本题考查简单的分数运算,计算时要细心,注意把结果化成最简分数.
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