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분수 2자리 (분모가 같은)

1
6 21
+
1 21
=
7 21
6
+
1
=
1 3
2
2 15
+
4 15
=
6 15
2
+
4
=
2 5
3
4 19
+
9 19
=
13 19
4
9 16
+
5 16
=
14 16
9
+
5
=
7 8
5
5 15
+
6 15
=
11 15
6
6 85
+
7 85
=
13 85
7
7 18
+
6 18
=
13 18
8
6 89
+
4 89
=
10 89
9
4 25
+
5 25
=
9 25
10
5 54
+
6 54
=
11 54
11
6 28
+
2 28
=
8 28
6
+
2
=
2 7
12
2 55
+
6 55
=
8 55
13
6 56
+
5 56
=
11 56
14
5 43
+
1 43
=
6 43
15
1 86
+
4 86
=
5 86