找规律7,5,14,4,21,3,( ),( )7,5,14,4,21,3,( ),( )

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找规律7,5,14,4,21,3,( ),( )7,5,14,4,21,3,( ),( )
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找规律7,5,14,4,21,3,( ),( )7,5,14,4,21,3,( ),( )
找规律7,5,14,4,21,3,( ),( )
7,5,14,4,21,3,( ),( )

找规律7,5,14,4,21,3,( ),( )7,5,14,4,21,3,( ),( )
晕 7 ,5, 14, 4, 21, 3, (28),(2)奇数项每次增加7或是说是7的倍数,偶数项每次递减1