问题 解答题
怎样简便就怎样算:
35×1
3
10
×3
17
21

25
25
28
×4
1
5
7
×5.6+
4
5

2
9
+
2
27
)×27.
答案

35×1

3
10
×3
17
21

=35×

13
10
×
80
21

=173

1
3

25

25
28
×4

=25×4+

25
28
×4,

=100+3

4
7

=103

4
7

1

5
7
×5.6+
4
5

=

12
7
×
28
5
+
4
5

=

48
5
+
4
5

=10

2
5

(

2
9
+
2
27
)×27

=

2
9
×27+
2
27
×27,

=6+2,

=8.

单项选择题
单项选择题