题目内容

口算
3
8
÷
1
12
=		 32×
1
3
=		 1-
3
8
-
5
8
=
1
6
×
9
7
=
2-
4
5
=
5
7
×
7
5
-1=
3
4
+
1
2
=
8
9
×
3
4
=
分析：根据分数四则运算的计算法则直接进行口算．
解答：
解：
3
8
÷
1
12
=
9
2
32×
1
3
=3
1-
3
8
-
5
8
=0
1
6
×
9
7
=
3
14
2-
4
5
=1
1
5
5
7
×
7
5
-1=0
3
4
+
1
2
=
5
4
8
9
×
3
4
=
2
3
．
点评：完成本题要熟悉分数的各种计算法则，同时要细心，发现每一题的特点，能简便计算的简便计算．
练习册系列答案
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口算：
1
9
+
5
9
=
7
11
-
7
11
=
1
2
+3=		 2.6-1
3
5
=
5-
8
11
=
1
5
-
1
6
=
11
14
+
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14
=
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-
1
12
=
2-
1
3
-
2
3
=
2
3
+
1
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-
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3
=		 1
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7
-（
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7
+
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8
）=
3
4
+
3
8
+
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4
+
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8
=
口算．
5
6
-
1
6
=
1
8
+
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8
=
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-
1
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=
7
8
-
1
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=
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-
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=		 1-
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=
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+
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3
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-
3
8
=
7
8
-
3
8
=
10
9
+
8
9
=
4
11
-
4
11
=
1
6
+
1
4
=
口算：
7
12
+
1
12
=		 1-
1
15
-
2
15
=
3
8
+
5
8
=		 40×50=
5÷15= 125×80= 40×25= 3500÷50=
268+56= 356-24-76= 75÷5=
7
32
-
2
32
=
2
9
+
2
9
+
1
9
=		 1000÷200=
口算
3
8
×6=
3
4
+
1
2
=
3
10
×
2
3
=
5
54
×6=
1
4
÷
3
5
=
3
5
÷
1
6
=		 1-
1
4
=
4
7
-
1
3
=
2
5
×4=
5
6
÷
1
12
=

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