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. 5ng2sYVsGHG6WRRfAN1ApKmEHAUO+W0ZQpa89Ofvm/gi/78lnTC6X2p358rptqIE