问题 解答题
计算.
5400-2940÷28×27;(20.2×0.4+7.88)÷4.2;
4
5
+
1
4
)÷
7
3
+
7
10
10÷[
8
3
-(
5
13
÷
5
26
+
2
5
)].
答案

(1)5400-2940÷28×27

=5400-105×27,

=5400-2835,

=2565;

(2)(20.2×0.4+7.88)÷4.2

=(8.08+7.88)÷4.2,

=15.96÷4.2,

=3.8;

(3)(

4
5
+
1
4
)÷
7
3
+
7
10

=

21
20
÷
7
3
+
7
10

=

9
20
+
7
10

=1

3
20
(4)10÷[
8
3
-(
5
13
÷
5
26
+
2
5
)]

=10÷[

8
3
-(2+
2
5
)],

=10÷[

8
3
-
12
5
],

=10÷

4
15

=37

1
2

单项选择题
单项选择题