如图,在正方体ABCD-A1B1C1D1中,M,N分别是棱C1D1,C1C的中点.以下四个结论:

如图,在正方体ABCD-A1B1C1D1,M,N分别是棱C1D1,C1C的中点.以下四个结论:

①直线AM与直线CC1相交;

②直线AM与直线BN平行;

③直线AM与直线DD1异面;

④直线BN与直线MB1.

其中正确结论的序号为       (:把你认为正确的结论序号都填上).

答案

③④

【解析】由图可知AMCC1是异面直线;AMBN也是异面直线;AMDD1是异面直线;BNMB1也是异面直线,故①②错误,③④正确.

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