二、能力提升

11.

12.374÷

13.

14. ×39.75+ ×46.25+ ×37.2

15.

16.1× ×2× ×3× ×…×2016×

17.2016×2018×

18.

19.2016× × ×…×

20. d/njLxUjHF+9b3fLb44Jf0SgrkhZUkDHT8QD7Niobu7hYqsSvnlWbhSRIROq3hjJ