2,3,4,6,6,9,8,( 12 ),( 10

问题描述:

2,3,4,6,6,9,8,( 12 ),( 10

奇数项:2,4,6,8,10,(12),(14) 偶数项:3,6,9,12,(15),(18) 所以需填的三个为15,12,18.