二年级上册数学找规律练习 1 2, 4,6,( ),( ),12,( )2 1, 3,5,( ),( ),11,( )3 42,35,( ),( ),( ),74 68,( ),62,( ),( ),( )5 3,4,7,11,( ),29,( ),( )6 2,2,4,6,10,( ),( ),( )7 1,2,4,7,( ),( ),( ),( )8 1,3,7,13,( ),( ),( ),( )9 1,1,2,3,5,( ),( ),( ),( )10 1,5,9,13,( ),( ),( ),( )11 5,10,15,( ),( ),( ),( )12 27,24,21,18,( ),( ),( ),( )13 1,2,3,5,8,( ),( ),( ),( )14 1,50,2,45,3,40,( ),( ),( ),( )15 1,5,10,( ),( ),( ),( )