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소숫점: 1자리 덧셈20

1
2.5
+
9.9
=
12.4
2
5.6
+
4.1
=
9.7
3
9.1
+
8.8
=
17.9
4
4.7
+
9.6
=
14.3
5
3.1
+
2.5
=
5.6
6
8.4
+
5.8
=
14.2
7
1.3
+
4.2
=
5.5
8
3.4
+
6.9
=
10.3
9
6.1
+
4.5
=
10.6
10
3.1
+
4.7
=
7.8
11
3.1
+
8.1
=
11.2
12
6.1
+
5.9
=
12
13
2.1
+
9.8
=
11.9
14
3.1
+
6.9
=
10
15
5.3
+
3.8
=
9.1