问题 解答题
脱式计算
4
5
×
2
7
+
4
5
÷
7
5
(1375+450÷18)×200
0.4÷(2.4×4-36×0.25)3
2
9
-
6
5
×
5
7
-2
1
7
答案

4
5
×
2
7
+
4
5
÷
7
5

=

8
35
+
20
35

=

4
5

(1375+450÷18)×200,

=(1375+25)×200

=280000;

0.4÷(2.4×4-36×0.25),

=0.4÷(9.6-9),

=0.4÷0.6,

=

2
3

3

2
9
-
6
5
×
5
7
-2
1
7

=3

2
9
-
6
7
-2
1
7

=3

2
9
-(
6
7
+2
1
7
),

=3

2
9
-3,

=

2
9

单项选择题
单项选择题