-7,-4,0,4,7,8,( )。A.12B.9C.6D.3

-7,-4,0,4,7,8,( )。

A.12

B.9

C.6

D.3


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-7,-4,0,4,7,8.()。A.12B.9C.6D。3

习题:7-1、7-3、7-4、7-9、7-17、7-18、7-19、7-20

要求做7-7;7-8;7-9;7-11;7-12.不需要做7-10