40道少字找规律奥数题

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40道少字找规律奥数题40道少字找规律奥数题40道少字找规律奥数题25,19,21,17,17,15,13,13()()8,24,12,36,18()()2,5,11,23,47()()1,4,9,1

40道少字找规律奥数题
40道少字找规律奥数题

40道少字找规律奥数题
25,19,21,17,17,15,13,13()()
8,24,12,36,18()()
2,5,11,23,47()()
1,4,9,16,25()()
2,3,8,8,14,13,20()()
81,162,54,108,36,72()()
1,2,3,5,8,(),21
1,4,9,16,(),36
1,2,8,(),32768

1,4,9,16,25(36)(49)----(36),(49)
.1,2,3,5,8,(13),21。。。----(13)
1,4,9,16,(25),36-------------(25)
1,2,8,(128),32768 -------(128),
公式为power(2,(power(2,(n-1)-1),用excel计算得:
11
22
83
1284
327685
21474836486

1,2,8,(128)32768公式应该是前一个数平方的两倍,OK