题目内容

直接写得数
1
4
÷
2
3
=
3
4
×
4
7
=
1
3
-
1
4
=		 6÷
1
8
=
5
12
×
5
6
=		 32÷
4
5
=		 5-
1
2
=
5
14
×35=
分析：分数乘整数，用分数的分子和整数相乘的积做分子，分母不变；分数乘分数，用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；分数除以一个数，等于乘这个数的倒数；异分母分数相加减，先依据分数的基本性质化成同分母分数，再进行加减．
解答：解：

1
4
÷
2
3
=
3
8
3
4
×
4
7
=
3
7
1
3
-
1
4
=
1
12
 6÷
1
8
=48
5
12
×
5
6
=
25
72
 32÷
4
5
=40		 5-
1
2
=
9
2
5
14
×35=
25
2
点评：此题主要考查分数四则运算的计算法则的灵活应用．
练习册系列答案
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直接写得数
1÷
2
3
8
11
÷2		 4×20%
4
5
×4
1
3
+
1
4
 1÷75% 1%÷10% 42%-0.42．
直接写得数．
2
3
×
6
7
=
2
5
÷
3
10
=
4
5
+
1
10
=
4
9
-
1
3
=		 14×
2
21
=
2
5
+
1
2
=
3
7
-
1
6
=
9
10
×
5
7
=
5
12
÷
5
6
=
2
5
×
1
6
=
2
3
×
5
9
=
6
7
÷
3
14
=
直接写得数．
2
3
×2=		 1÷
10
9
=
6
7
÷
2
7
=		 1-25%=
4×10%= 9÷
9
11
=
1
4
+
2
3
=
5
21
×
14
25
=
直接写得数．
2
3
×
6
7
=
4
5
+
1
10
=
4
9
-
1
3
=
2
5
+
1
2
=
3
7
×
1
6
=
1
2
÷
2
3
=
9
10
-
2
5
=
3
4
×
2
3
=
14×
2
21
=		 20÷
4
9
=		 0×
2
5
=
2
23
×23×1=

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