题目内容

1
2
-
1
5
=
2
3
+
1
4
=
1
13
+
7
13
=
5
7
-
2
7
=
3
8
-
3
8
=
7
10
-
7
20
=
1
4
+
3
8
=
4
7
-
1
6
=
1-
1
5
-
2
5
=
5
9
+
4
9
=
分析：根据分数的加减法进行计算即可得到答案．
解答：
解：
1
2
-
1
5
=
3
10
2
3
+
1
4
=
11
12
1
13
+
7
13
=
8
13
5
7
-
2
7
=
3
7
3
8
-
3
8
=0
7
10
-
7
20
=
7
20
1
4
+
3
8
=
5
8
4
7
-
1
6
=
17
42
1-
1
5
-
2
5
=
2
5
5
9
+
4
9
=1
故填：
3
10
，
11
12
，
8
13
，
3
7
，0，
7
20
5
8
，
17
42
，
2
5
，1．
点评：此题主要考查的是分数的加减法运算．
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4
9
÷[
4
5
-（
1
5
+
1
3
）]		  
1
3
+3-（
1
4
+
1
12
）		 3×（
2
15
+
1
12
）-
2
5
3
4
×
5
7
×
4
3
-
1
2
15
16
+（
7
16
-
1
4
）÷
1
2
 23-
8
9
×
3
8
÷
1
27
（
1
3
-
1
4
）÷
1
2
+
5
6
1
2
×3+
1
2
÷
1
5
2
3
+（
4
7
+
1
2
）×
7
25
8×
5
6
+
2
5
÷4．
（2011?海口模拟）
直接写出得数
1-0.375=		 0.125×8= 280-45= 1.3÷0.25=
400÷600= 8.64×100=
1
2
+
1
4
=
1
2
-
1
5
=
2
3
×
3
8
=
3
4
÷
1
2
=		 12×
5
6
=		 6÷
2
3
=
口算
1
4
×
1
3
=
4
7
÷2=
1
2
÷
1
2
=		 10÷
5
6
=
2
3
×
3
4
=
9
10
÷
1
5
=
1
6
÷6=
8
9
÷4=		 15×
4
5
=		 15÷
1
3
=
3
4
×
2
9
=
2
3
÷
1
2
=
2
5
×
1
2
=
1
2
÷
1
4
=
1
2
×
1
4
=
4
5
÷
1
5
=
3
7
×14=
1
4
÷
1
2
=
1
2
-
1
4
=
4
9
×
3
4
=
5
8
×
2
5
=
1
6
÷
2
3
=
1
2
+
1
4
=
3
5
÷1=
7
15
×5=		 1÷
3
4
=
1
2
÷
1
4
=		 1÷
3
5
=
3
4
×12=
1
5
÷
2
3
=
7
9
×
3
7
=		 1-
3
5
=		 18×
5
6
=		 7÷
7
5
=
1
3
+
1
6
=		 1+
3
5
=
2
9
×
1
4
=
8
3
÷2=
3
5
÷
2
5
=
5
9
÷3=
5
6
×
3
10
=
2
5
÷
1
2
=
8×
1
4
=		 9÷
3
4
=		 30×
1
3
=
4
5
÷2=
5
24
÷
5
6
=
5
8
×
1
2
×0=
1
3
×
3
11
=		 8÷
1
4
=
9
10
÷
3
5
=		 0÷
1
3
÷
1
2
=		 1×
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=		 0×
2
9
÷
1
2
=
5
6
×
6
5
=
1
5
÷
1
3
=		 0÷
5
12
=		 1×
1
2
÷
1
2
=
直接写出得数
1
2
-
1
5
=		 (
2
3
+
1
2
)×12=
5
4
×8+8×
1
4
=
1
9
÷
2
3
=
5
8
÷
2
3
=		 26×
3
13
=		 (
2
3
+
1
2
)×12=
1
3
+
1
2
=

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