问题 解答题
直接写出得数.
4
5
-
1
5
=

1-
7
8
=

2
5
-
1
10
=

2
3
+
2
5
=

1
7
+
3
4
=
7
8
-
3
4
=
1
2
5
+
3
5
=
1
16
+
1
4
=
1
4
-
3
9
=
5
8
-0.375
=
答案

4
5
-
1
5
=
3
5
1-
7
8
=
1
8
2
5
-
1
10
=
3
10
2
3
+
2
5
=1
1
15
1
7
+
3
4
=
25
28

7
8
-
3
4
=
1
8
1
2
5
+
3
5
=2
1
16
+
1
4
=
5
16
1
4
-
3
9
=-
1
12
5
8
-0.375=0.25

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