问题 解答题
15
16
-
7
16
=
3
8
+
2
8
=
6
9
+
3
9
=
1-
13
18
=
______-
7
15
=
4
15
______+
1
6
=1
3
20
+______=
13
20
1-______=
3
11
答案

15
16
-
7
16
=
1
2
3
8
+
2
8
=
5
8
6
9
+
3
9
=1,
1-
13
18
=
5
18
11
15
-
7
15
=
4
15
5
6
+
1
6
=1,
3
20
+
10
20
=
13
20
1-
8
11
=
3
11

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