题目内容

计算,我能行.
1
4
+
2
4
=
5
8
-
2
8
=
6
20
+
9
20
=
1-
5
6
=
3
7
+
4
7
=
1-
7
12
=
8
9
-
3
9
=
1-
1
5
=
7
10
-
3
10
=
1
6
+
2
6
=
2
6
+
4
6
=
11
15
+
4
15
=
1
2
+
1
2
=
3
12
+
8
12
=
4
18
+
8
18
=
分析:通过观察,发现这些都是有关同分母分数的加减计算的题目,在计算时,只把分子相加减,分母不变,能约分的要约分,据此解答.
解答:解:
1
4
+
2
4
=
3
4
5
8
-
2
8
=
3
8
6
20
+
9
20
=
3
4
1-
5
6
=
1
6
3
7
+
4
7
=1
1-
7
12
=
5
12
8
9
-
3
9
=
5
9
1-
1
5
=
4
5
7
10
-
3
10
=
2
5
1
6
+
2
6
=
1
2
2
6
+
4
6
=1
11
15
+
4
15
=1
1
2
+
1
2
=1
3
12
+
8
12
=
11
12
4
18
+
8
18
=
2
3
点评:掌握同分母分数的计算法则,即可解决问题.但在有“1”的计算中,要把“1”写成与分数同分母的分数,再计算.
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