按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).(3)3,1,3,4,3,9,3,16,3,( ),( ).
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![按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).(3)3,1,3,4,3,9,3,16,3,( ),( ).](/uploads/image/z/202290-42-0.jpg?t=%E6%8C%89%E8%A7%84%E5%BE%8B%E5%A1%AB%E6%95%B0.%EF%BC%881%EF%BC%8921%2C18%2C15%2C%EF%BC%88+%EF%BC%89%2C%EF%BC%88+%EF%BC%89%2C6%2C%EF%BC%88+%EF%BC%89%2C0.%EF%BC%882%EF%BC%893%2C9%2C27%2C81%2C%EF%BC%88+%EF%BC%89%2C%EF%BC%88+%EF%BC%89%2C%EF%BC%88+%EF%BC%89.%E6%8C%89%E8%A7%84%E5%BE%8B%E5%A1%AB%E6%95%B0.%EF%BC%881%EF%BC%8921%2C18%2C15%2C%EF%BC%88+%EF%BC%89%2C%EF%BC%88+%EF%BC%89%2C6%2C%EF%BC%88+%EF%BC%89%2C0.%EF%BC%882%EF%BC%893%2C9%2C27%2C81%2C%EF%BC%88+%EF%BC%89%2C%EF%BC%88+%EF%BC%89%2C%EF%BC%88+%EF%BC%89.%EF%BC%883%EF%BC%893%2C1%2C3%2C4%2C3%2C9%2C3%2C16%2C3%2C%EF%BC%88+%EF%BC%89%2C%EF%BC%88+%EF%BC%89.)
按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).(3)3,1,3,4,3,9,3,16,3,( ),( ).
按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).
按规律填数.
(1)21,18,15,( ),( ),6,( ),0.
(2)3,9,27,81,( ),( ),( ).
(3)3,1,3,4,3,9,3,16,3,( ),( ).
按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).按规律填数.(1)21,18,15,( ),( ),6,( ),0.(2)3,9,27,81,( ),( ),( ).(3)3,1,3,4,3,9,3,16,3,( ),( ).
按规律填数.(1)21,18,15,( 12 ),( 9 ),6,( 3 ),0.
(2)3,9,27,81,( 243 ),( 729 ),( 2187 ).
(3)3,1,3,4,3,9,3,16,3,(25 ),( 3 ).
12,9,3
243,729,2187
27,3
(1)21,18,15,( 12),( 9 ),6,( 3 ),0.
(2)3,9,27,81,( 243 ),( 729 ),( 2187 )。
(3)3,1,3,4,3,9,3,16,3,( 25 ),( 3 )。
望采纳
(1)21,18,15,(12 ),( 9 ),6,( 3 ),0.每个比前一个小3
(2)3,9,27,81,( 243 ),( 729 ),( 2187 )。每个是前一个的3倍
(3)3,1,3,4,3,9,3,16,3,( 25 ),( 3 )。偶数项是平方项。
(1)21,18,15,(12 ),( 9 ),6,( 3 ),0.每个比前一个小3
(2)3,9,27,81,( 243 ),( 729 ),( 2187 )。每个是前一个的3倍
(3)3,1,3,4,3,9,3,16,3,( 25 ),( 3 )。偶数项是平方项。