问题 解答题
2
3
+
2
9
)×(
5
8
-
7
16
2
5
×
3
4
-
1
2
÷4
[
8
15
-(
7
12
-
2
5
)]×
15
14
答案

(1)(

2
3
+
2
9
)×(
5
8
-
7
16
),

=

8
9
×
3
16

=

1
6

(2)

2
5
×
3
4
-
1
2
÷4,

=

3
10
-
1
8

=

7
40

(3)[

8
15
-(
7
12
-
2
5
)]×
15
14

=[

8
15
-
11
60
15
14

=

7
20
×
15
14

=

3
8

单项选择题
单项选择题