找规律初中(1)1,9,25,49, , ;(1)1,9,25,49, , ;(2)2/3,3/9,4/27, , ;(3)1,-2,4,-8, , .

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找规律初中(1)1,9,25,49, , ;(1)1,9,25,49,     ,     ;(2)2/3,3/9,4/27,        ,           ;(3)1,-2,4,-8,      ,        .
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找规律初中(1)1,9,25,49, , ;(1)1,9,25,49, , ;(2)2/3,3/9,4/27, , ;(3)1,-2,4,-8, , .
找规律初中(1)1,9,25,49, , ;
(1)1,9,25,49, , ;(2)2/3,3/9,4/27, , ;(3)1,-2,4,-8, , .

找规律初中(1)1,9,25,49, , ;(1)1,9,25,49, , ;(2)2/3,3/9,4/27, , ;(3)1,-2,4,-8, , .
(1)9-1=8
25-9=16 所以是差值×2
(2)分子+1 分母×3
(3)每个数乘-2