直接寫出得數(shù).
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:同分母分數(shù)相加減,分母不變,分子相加減;
異分母分數(shù)相加減,先通分,變成同分母的分數(shù)再計算.
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
點評:本題考查了簡單分數(shù)加減法的計算,計算時要細心,注意把結(jié)果化成最簡分數(shù).
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