:39-1,38+2,37-3,36+1,35-2,34+3,…第40项为( )
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:39-1,38+2,37-3,36+1,35-2,34+3,…第40项为( )
A.1-1 B.-1-1 C.0-1 D.0+1
参考答案:
:39-1,38+2,37-3,36+1,35-2,34+3,…第40项为( )
A.1-1 B.-1-1 C.0-1 D.0+1
参考答案: