一、按规律画图
(4)仔细观察下图,接着画
(5)观察下图的变化,想一想第4幅图应画上怎样的图形?
二、找找下列各数列的规律,在括号内填上合适的数。
(1)1,3,5,( ),9
(2)1,4,( ),10,13,( ) ,( )
(3)1,5,( ),13,( ) ,( )
(4)2,4,( ),( ),12,( )
(5)1,7,( ),19,( ),31,( )’43’
(6)5,10,( ),20,( ),30,( ),35,( )
(7)3,6,9,( ),( ),18,( ),24
(8)2,6,10,( ),( ),22,( ),( ),32,( )
(9)35,30,( ),( ),15,( ),( )
(10)50,40( ),( ),( )
(11)65,60,( ),( ),( ),40,( ),( ),( )
(12)57,50,( ),( ),( ),22,( ).( ),13
(14)66,61,( ),( ),46,( ),( ),31,( )
(15)5,15,( ),( ),( ),55,( ),( )
(16)95,85,( ),( ),55,( ),( ),25,( ),( )
(17)22,20,( ),( ),( ),12,( ),( ),( ),( )
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