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분수: 분모가 다른 덧셈3분수2

1
2 4
+
1 7
=
18 28
2
+
1
=
9 14
2
1 2
+
4 6
=
7 6
3
4 6
+
6 9
=
24 18
4
+
6
=
4 3
4
6 9
+
4 7
=
78 63
6
+
4
=
26 21
5
4 7
+
2 6
=
38 42
4
+
2
=
19 21
6
2 9
+
1 4
=
17 36
7
1 4
+
6 5
=
29 20
8
6 5
+
4 4
=
44 20
6
+
4
=
11 5
9
4 4
+
2 8
=
10 8
4
+
2
=
5 4
10
2 8
+
7 4
=
16 8
2
+
7
=
2
11
4 3
+
1 8
=
35 24
12
1 8
+
4 3
=
35 24
13
4 3
+
2 4
=
22 12
4
+
2
=
11 6
14
1 3
+
8 6
=
10 6
1
+
8
=
5 3
15
8 6
+
2 8
=
38 24
8
+
2
=
19 12