问题 解答题
计算下面各题.
5
18
+
7
18
=
8
9
-
2
9
=
17
72
-
5
72
=
7
12
+
3
8
=
7
9
-
2
13
=
5
6
+
3
10
=
5
11
-
1
3
=
1
4
+
6
7
=
4
5
-
5
8
=
答案

5
18
+
7
18
=
2
3
8
9
-
2
9
=
2
3
17
72
-
5
72
=
1
6
7
12
+
3
8
=
23
24
7
9
-
2
13
=
73
117
5
6
+
3
10
=
17
15
5
11
-
1
3
=
4
33
1
4
+
6
7
=
31
28
4
5
-
5
8
=
7
40

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