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분수: 분모가 다른 덧셈2분수2

1
2 6
+
1 7
=
20 42
2
+
1
=
10 21
2
3 7
+
2 2
=
20 14
3
+
2
=
10 7
3
2 2
+
5 3
=
16 6
2
+
5
=
8 3
4
5 3
+
4 7
=
47 21
5
4 7
+
1 9
=
43 63
6
1 9
+
3 7
=
34 63
7
3 7
+
5 3
=
44 21
8
5 3
+
1 5
=
28 15
9
1 5
+
3 4
=
19 20
10
1 4
+
4 6
=
11 12
11
4 6
+
1 2
=
7 6
12
1 2
+
2 4
=
4 4
1
+
2
=
1
13
3 2
+
9 5
=
33 10
14
9 5
+
5 8
=
97 40
15
8 5
+
9 8
=
109 40