如图,正方体ABCD-A 1 B 1 C 1 D 1 中,E、F、G、H分别是所在棱的三等分点,且 BF=DE= C 1 G= C 1 H= 1 3 AB . (1)证明:直线EH与FG共面; (2)若正方体的棱长为3,求几何体GHC 1 -EFC的体积.
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参考答案:
举一反三
【简答题】Two Englishmen were traveling in France when a policeman stopped their car and gave it a search. He found a bag of white powder, which looked suspicious(可疑的). “Drogue?” asked the policeman who was sen...