找规律:2,1,4,3,6,5,8,7...( )第n个数
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找规律:2,1,4,3,6,5,8,7...()第n个数找规律:2,1,4,3,6,5,8,7...()第n个数找规律:2,1,4,3,6,5,8,7...()第n个数2,1,4,3,6,5,8,72
找规律:2,1,4,3,6,5,8,7...( )第n个数
找规律:2,1,4,3,6,5,8,7...( )第n个数
找规律:2,1,4,3,6,5,8,7...( )第n个数
2,1,4,3,6,5,8,7
2 4 6 8
1 3 5 7
奇数项为偶数,为n+1;偶数项为奇数,为n-1
所以n为奇数时,第n个数为n+1,n为偶数时,第n个数为n-1.
an=n-1(n为偶数)
n+1(n为奇数)
n-1 (n为偶数)
n+1 (n为奇数)