问题 解答题
脱式计算.
5
6
×8+
4
5
÷4

3
8
×.
4
5
÷
3
8
×
4
5

2
13
×
5
8
÷
15
26

(455-12.5×4)÷8.1.
答案

(1)

5
6
×8+
4
5
÷4,

=

20
3
+
1
5

=

103
15

(2)

3
8
×
4
5
÷
3
8
×
4
5

=

3
10
÷
3
8
×
4
5

=

4
5
×
4
5

=

16
25

(3)

2
13
×
5
8
÷
15
26

=

5
52
÷
15
26

=

1
6

(4)(455-12.5×4)÷8.1,

=(455-50)÷8.1,

=405÷8.1,

=50.

选择题
单项选择题