问题 解答题
直接写得数.
1
3
-
1
4
=
1-
3
4
=
1
5
+
1
6
=
2
4
-
1
2
=
5
8
+
7
8
=
6
7
+7=
4-
7
13
=
9
10
-0.9=
5
9
-
1
9
=
5
8
+
1
4
=
5
3
-1=
2
11
+
1
4
+
9
11
=
答案

1
3
-
1
4
=
1
12
1-
3
4
=
1
4
1
5
+
1
6
=
11
30
2
4
-
1
2
=0,
5
8
+
7
8
=
3
2
6
7
+7=7
6
7
4-
7
13
=3
6
13
9
10
-0.9=0,
5
9
-
1
9
=
4
9
5
8
+
1
4
=
7
8
5
3
-1=
2
3
2
11
+
1
4
+
9
11
=1
1
4

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