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분수: 분모가 다른 덧셈3분수7

1
3 7
+
4 4
=
40 28
3
+
4
=
10 7
2
4 4
+
2 9
=
44 36
4
+
2
=
11 9
3
2 9
+
4 7
=
50 63
4
4 7
+
8 4
=
72 28
4
+
8
=
18 7
5
8 4
+
1 8
=
17 8
6
1 2
+
9 4
=
11 4
7
4 9
+
8 2
=
80 18
4
+
8
=
40 9
8
2 3
+
1 5
=
13 15
9
1 5
+
6 2
=
32 10
1
+
6
=
16 5
10
6 2
+
3 5
=
36 10
6
+
3
=
18 5
11
5 7
+
1 4
=
27 28
12
1 9
+
7 5
=
68 45
13
9 5
+
1 8
=
77 40
14
1 8
+
4 5
=
37 40
15
5 4
+
4 5
=
41 20