问题 解答题
直接写得数.
1-
2
7
=
4
9
+
3
9
=
1
3
+
1
2
=
1-
1
5
-
1
4
=
3
4
+3=
11
21
+
4
21
=
1
18
+
11
18
=
3
4
+
1
5
+
1
4
=
答案

1-
2
7
=
5
7
4
9
+
3
9
=
7
9
1
3
+
1
2
=
5
6
1-
1
5
-
1
4
=
11
20
3
4
+3=3
3
4
11
21
+
4
21
=
5
7
1
18
+
11
18
=
2
3
3
4
+
1
5
+
1
4
=1
1
5

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