题目内容

直接写得数
1
2
×
1
3
=
2
3
×
1
2
=
3
4
×
2
5
=
7
9
×
3
4
=
6
7
×
5
6
=
2
5
×
2
3
=
1
6
×
8
15
=
9
25
×
5
6
=
12
13
×
1
4
=
分析：此题属于分数的乘法计算，分子相乘的积做分子，分母相乘的积做分母，能约分的要约分，据此解答．
解答：
解：
1
2
×
1
3
=
1
6
2
3
×
1
2
=
1
3
3
4
×
2
5
=
3
10
7
9
×
3
4
=
7
12
6
7
×
5
6
=
5
7
2
5
×
2
3
=
4
15
1
6
×
8
15
=
4
45
9
25
×
5
6
=
3
10
12
13
×
1
4
=
3
13
点评：掌握分数乘法的方法，是解题的关键．
练习册系列答案
相关题目
直接写得数
1
2
-
1
3
=		 1÷
1
6
=
2
3
×
3
2
=
4
9
÷
1
8
=
3
5
×
1
6
=
2
7
×14=
1
3
+
1
4
=		 2-
2
7
=
4
9
÷
2
3
=
1
10
÷
1
5
=
直接写得数．
1
3
-
1
6
=
7
12
+
5
6
=		 1+
4
9
=
1
2
-
1
8
=
1-
3
5
=
1
4
+
1
5
=		 1-
4
15
=
6
7
+
4
5
+
1
7
=
6
1
2
-
1
4
=		 7-
4
9
-
5
9
=		 8-4
4
5
=
1
6
+
4
7
+
5
6
+
3
7
=
直接写得数．
1
3
-
1
4
=		 1-
3
4
=
1
5
+
1
6
=
2
4
-
1
2
=
5
8
+
7
8
=
6
7
+7=
4-
7
13
=
9
10
-0.9=
5
9
-
1
9
=
5
8
+
1
4
=
5
3
-1=
2
11
+
1
4
+
9
11
=
直接写得数
1
2
-
1
5
=		 2008-208=
1
5
+
4
5
=		 1.03+0.07= 0.35×100=
3
8
×
8
9
=		 20÷25%= （
1
3
+1）÷1
1
3
=		 0.6：0.36= 0.45×0=

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