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

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

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.