一、双基训练

1.2017×

2.0.75÷

3.

4.（3-1.4 ）×

5.3-

6. ×39+ ×27

7. -0.25

8.5- ×21

9.

10. aOW6qmtrVlTfc7COPRqdVeDHtty2ugjQUhe41qGapVd8dY3XfOejDLwo9q0fK/43