问题 解答题
计算下面各题:
4
7
×
21
10
×
2
5
           
  
3
5
×
2
9
×15                
 15÷
9
10
×
3
5

5
12
÷
5
9
                
 
5
8
÷
7
12
÷
7
10
               
1
2
÷
5
4
×
2
3
答案

4
7
×
21
10
×
2
5

=

6
5
×
2
5

=

12
25

3
5
×
2
9
×15=2;

③15÷

9
10
×
3
5

=15×

10
9
×
3
5

=10;

④4×

5
12
÷
5
9

=

5
3
×
9
5

=3;

5
8
÷
7
12
÷
7
10

=

5
8
×
12
7
×
10
7

=

75
49

1
2
÷
5
4
×
2
3

=

1
2
×
4
5
×
2
3

=

4
15

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