题目内容

1
2
+
1
3
=
1
2
-
1
4
=
2
5
-
1
5
=
4
7
-
1
7
=
7
8
-
3
8
=
1
10
+
2
5
=
5
6
-
2
3
=
1
3
+
1
5
=
3
8
-
1
4
=
2
3
+
1
3
=
3
8
+
3
8
=
1
2
-
1
5
=
4
7
+
3
7
=		 1-
7
8
=
5
6
+
5
6
=
1-
5
12
=
3
5
+
1
2
=
9
10
-
3
10
=
5
7
-
5
7
=
3
8
+
5
8
=
分析：根据分数加减法的计算方法进行计算．
解答：
解：
1
2
+
1
3
=
5
6
，
1
2
-
1
4
=
1
4
，
2
5
-
1
5
=
1
5
，
4
7
-
1
7
=
3
7
，
7
8
-
3
8
=
1
2
，
1
10
+
2
5
=
1
2
，
5
6
-
2
3
=
1
6
，
1
3
+
1
5
=
8
15
，
3
8
-
1
4
=
1
8
，
2
3
+
1
3
=1，
3
8
+
3
8
=
3
4
，
1
2
-
1
5
=
3
10
，
4
7
+
3
7
=1，		 1-
7
8
=
1
8
，
5
6
+
5
6
=
5
3
，
1-
5
12
=
7
12
，
3
5
+
1
2
=
11
10
，
9
10
-
3
10
=
3
5
，
5
7
-
5
7
=0，
3
8
+
5
8
=1．
点评：同分母分数相加减，分母不变，只把分子相加减；
异分母分数相加减，先通分，然后再按照同分母分数加减法进行计算．
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5
8
÷
2
3
=		 26×
3
13
=
7
8
×
1
14
=
1
9
÷
7
8
=
2
3
+
1
2
=
1
3
+
1
2
=		 44÷
11
10
=
1
2
-
1
5
=		 6.4÷20%= 125%×8=
直接写出得数：
1.8+1.8÷1.5-0.5×0.3
33×34+33×66
[
5
11
×（
2
5
+
1
3
）]÷
5
6

2-
1
2
+
1
3
-
1
2
+
1
3
-
1
4
．
直接写得数．
3
4
×16=		 12÷
3
5
=		 0.3×
6
5
=
3
5
÷÷
9
10
=		 1÷
7
8
=		 0×
7
12
+
1
8
=
5
7
×
2
3
÷
5
7
=
1
2
×
1
3
÷
1
2
×
1
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
=
1
2
×
1
3
=		 12×
5
6
=
5
8
×
4
15
=
8
9
×
27
40
=
11
18
×24=
3
4
×
8
9
=
11
38
×
19
22
=
3
12
×
24
39
=

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