问题 解答题
计算
1
5
-
1
8

3
5
-(
1
2
-
1
4

5
10
-
1
10
+
2
5
答案

(1)

1
5
-
1
8

=

8
40
-
5
40

=

3
40

(2)

3
5
-(
1
2
-
1
4
),

=

3
5
-
1
4

=

7
20

(3)

5
10
-
1
10
+
2
5

=

2
5
+
2
5

=

4
5

单项选择题 A1/A2型题
填空题