题目内容

口算．
5
6
-
1
6
=
1
8
+
5
8
=
3
10
-
1
10
=
7
8
-
1
16
=
5
8
-
1
8
=		 1-
7
8
=
1
6
+
1
12
=
3
8
-
3
8
=
7
8
-
3
8
=
10
9
+
8
9
=
4
11
-
4
11
=
1
6
+
1
4
=
分析：根据分数加减法的计算方法进行计算．
解答：解：
5
6
-
1
6
=
2
3
1
8
+
5
8
=
3
4
3
10
-
1
10
=
1
5
7
8
-
1
16
=
13
16
5
8
-
1
8
=
1
2
 1-
7
8
=
1
8
1
6
+
1
12
=
1
4
3
8
-
3
8
=0
7
8
-
3
8
=
1
2
10
9
+
8
9
=2
4
11
-
4
11
=0
1
6
+
1
4
=
5
12
．
点评：口算时，注意运算符号和数据，然后再进一步计算．
练习册系列答案
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0.56÷0.7= 4.8×0.1= 0.16÷1.6= 0.28×0.4= 0.9÷0.1=
3.2÷80= 27.9÷30= 3.4÷1.7= 1.5+0.15= 0.2×0.5÷0.2×0.5=
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口算．
25×16×0.125=
5
6
-
1
4
=		 075+
1
5
=
8.7÷0.03= 4.37+8.8= （
1
3
+
1
6
+
1
4
）×12=
0.322=
5
7
÷
5
6
=
3
4
×80%=
4700+800=
口算
1
3
÷
5
6
=
1
4
÷
2
5
=
5
6
÷12=
7
12
÷
14
3
=		 45÷
3
10
=
9÷
7
18
=
2
3
÷
9
10
=
4
25
÷
8
75
=		 18÷
1
6
=
4
11
÷
11
4
=
口算：
1
4
+
1
6
=
1
2
+
1
3
=		 4-
2
5
=		 1-
1
6
-
1
3
=
0.8+0.8×99= 35×
3
14
=		 24÷
3
8
=
3
10
×
5
6
=
2÷
1
2
=		 1-
1
5
+
4
5
=

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