题目内容

直接写出得数．
2
7
+
3
7
=
5
6
-
1
6
=
13
14
-
3
14
=
9
9
+
5
5
=
1
12
+
5
12
=		 1-
2
3
=
7
20
+
9
20
=
11
18
-
5
18
=
1
2
-
1
3
=
7
10
-
2
5
=		 0.6-
3
5
=		 2-
8
13
=
1
4
-
1
6
=
7
20
+
11
12
=
5
9
+
1
3
=		 1-
11
13
=
3.6+
2
5
=		 1-
7
20
=
7
8
-
1
4
=
7
9
-
7
12
．
分析：同分母分数相加减，分母不变，分子相加减；
异分母分数相加减，先通分，变成同分母的分数再计算．
解答：
解：
2
7
+
3
7
=
5
7
5
6
-
1
6
=
2
3
13
14
-
3
14
=
5
7
9
9
+
5
5
=2
1
12
+
5
12
=
1
2
 1-
2
3
=
1
3
7
20
+
9
20
=
4
5
11
18
-
5
18
=
1
3
1
2
-
1
3
=
1
6
7
10
-
2
5
=
3
10
 0.6-
3
5
=0		 2-
8
13
=1
5
13
1
4
-
1
6
=
1
12
7
20
+
11
12
=
19
15
5
9
+
1
3
=
8
9
 1-
11
13
=
2
13
3.6+
2
5
=4		 1-
7
20
=
13
20
7
8
-
1
4
=
5
8
7
9
-
7
12
=
7
36
．
点评：本题考查了简单分数加减法的计算，计算时要细心，注意把结果化成最简分数．
练习册系列答案
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12
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6
×0=
直接写出得数：
2
7
×2=
3
5
×1=		 12×
3
4
=
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7
=

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