问题 解答题
能简算的要简算.
( 
4
7
+
21
10
)×140             
 
5
8
÷
7
12
÷
7
10
                
15÷
9
10
×
3
5
答案

(1)(

4
7
+
21
10
)×140,

=

4
7
×140+
21
10
×140,

=80+294,

=374;

(2)

5
8
÷
7
12
÷
7
10

=

5
8
×
12
7
×
10
7

=

75
49

(3)15÷

9
10
×
3
5

=15×

10
9
×
3
5

=10.

问答题 简答题
填空题