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분수: 분모가 다른 덧셈2분수1

1
2 7
+
3 9
=
39 63
2
+
3
=
13 21
2
3 9
+
4 2
=
42 18
3
+
4
=
7 3
3
4 2
+
7 3
=
26 6
4
+
7
=
13 3
4
9 3
+
4 4
=
48 12
9
+
4
=
4
5
4 4
+
6 3
=
36 12
4
+
6
=
3
6
9 3
+
1 9
=
28 9
7
1 9
+
4 5
=
41 45
8
4 5
+
7 3
=
47 15
9
7 3
+
2 2
=
20 6
7
+
2
=
10 3
10
2 4
+
1 7
=
18 28
2
+
1
=
9 14
11
4 4
+
8 2
=
20 4
4
+
8
=
5
12
8 2
+
1 4
=
17 4
13
4 3
+
1 5
=
23 15
14
1 8
+
6 2
=
25 8
15
6 2
+
5 8
=
29 8