如图,在长方体ABCD-A
1B
1C
1D
1中,AB=2,BC=4,N、M分别为B
1C
1、BB
1的中点,且异面直线MN与AC所成的角为arccos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176775363/SYS201310241830141767753015_ST/0.png)
,求长方体ABCD-A
1B
1C
1D
1的体积.
考点分析:
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