按规律填数:1,-3.5,-7.9,-11( ) a.-13,15 b.13,15 c.13-,15 d.-13,-15

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按规律填数:1,-3.5,-7.9,-11( ) a.-13,15 b.13,15 c.13-,15 d.-13,-15
按规律填数:1,-3.5,-7.9,-11( ) a.-13,15 b.13,15 c.13-,15 d.-13,-15

按规律填数:1,-3.5,-7.9,-11( ) a.-13,15 b.13,15 c.13-,15 d.-13,-15
按规律填数:1,-3.5,-7.9,-11( )
c.13,-15

后一个数是前一个数加2
第偶数个加负号
1,-3.5,-7.9,-11,13,-15选c