题目内容

直接写得数
1
4
×
2
5
=
5
7
÷5=
5
6
×12=
7
12
×
3
14
=
2
5
÷
2
5
=
1
2
÷
1
4
=
7
8
×
8
7
=
5
8
=
4
9
+
2
9
=
45×
3
5
=
1
6
÷2=
2
3
÷
8
9
=
2
3
×
9
10
=
2
3
÷
1
3
=
3
4
×0=
5
12
×
2
3
=
1-
6
7
=
5
6
÷
5
3
=
4
11
×
11
4
=
15÷
1
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:
1
4
×
2
5
=
1
10
5
7
÷5=
1
7
5
6
×12=10,
7
12
×
3
14
=
1
8
2
5
÷
2
5
=1,
1
2
÷
1
4
=2,
7
8
×
8
7
=1,
5
8
=
8
5
4
9
+
2
9
=
2
3
45×
3
5
=27,
1
6
÷2=
1
12
2
3
÷
8
9
=
3
4
2
3
×
9
10
=
3
5
2
3
÷
1
3
=2,
3
4
×0=0,
5
12
×
2
3
=
5
18
1-
6
7
=
1
7
5
6
÷
5
3
=
1
2
4
11
×
11
4
=1,
15÷
1
5
=75.
点评:本题考查了分数乘除法的计算,计算时要细心,注意把结果化成最简分数.
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