填空;21,4,18,5,15,6,( ),( )
问题描述:
填空;21,4,18,5,15,6,( ),( )
答
12,7
奇数项4,5,6,7
偶数项21,18,15,12
填空;21,4,18,5,15,6,( ),( )
12,7
奇数项4,5,6,7
偶数项21,18,15,12