2,12,30,56() 2,5,14,41()() 2,5,13,36,104()2,12,30,56()()

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2,12,30,56() 2,5,14,41()() 2,5,13,36,104()2,12,30,56()()
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2,12,30,56() 2,5,14,41()() 2,5,13,36,104()2,12,30,56()()
2,12,30,56() 2,5,14,41()() 2,5,13,36,104()
2,12,30,56()()

2,12,30,56() 2,5,14,41()() 2,5,13,36,104()2,12,30,56()()
答案90
规律:
1*2=2
3*4=12
5*6=30
7*8=56
9*10=90
答案:122
规律
2+3=5
5+9=14
14+27=41
41+81=122
(其中3*3=9 9*3=27 27*3=81)
答案:307
规律:
2*3-1=5
5*3-2=13
13*3-3=36
36*3-4=104
104*3-5=307