按规律写数;2,7,5,10,15,( ),( ),23,21,( )…

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按规律写数;2,7,5,10,15,( ),( ),23,21,( )…

按规律写数;2,7,5,10,15,( ),( ),23,21,( )…
按规律写数;2,7,5,10,15,( ),( ),23,21,( )…

按规律写数;2,7,5,10,15,( ),( ),23,21,( )…
2,7,5,10,15,13,18,23,21,26,
后一项减前一项的规律是
5,-2, 5, 5,-2, 5, 5,-2, 5, 5,-2, 5, ~~~~~~~~~~~~~

2,7,5,10,15,20,18,21,26
大概~