(1)4/7,2/7,1/7,( ),1/28,( ),( ).(2)1/2,3/4,9/8,27/16,( ),( ).(3)1/2,1/3,1/4,1/9,1/8,1/27,( ),( ).(4)2/5,1/5,1/15,1/30,1/90,( ),( ).
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