https://bgk-photo.cdn.bcebos.com/doc/pic/item/64380cd7912397dd42ab2d2d5182b2b7d1a287cd.jpg如图，ABCD是正方形，PD⊥平面ABCD，点E是BC中点，点F在PB上，且PE=2FB．（1）求证：AC⊥平面AEF；（2）求证：PD∥平面AEF．
https://bgk-photo.cdn.bcebos.com/doc/pic/item/64380cd7912397dd42ab2d2d5182b2b7d1a287cd.jpg如图，ABCD是正方形，PD⊥平面ABCD，点E是BC中点，点F在PB上，且PE=2F
B、（1）求证：AC⊥平面AEF；（2）求证：PD∥平面AE
F、
发布时间：2025-04-04 20:52:57
=
=
，∵PF=2FB，∴
=
=
，∴连接FG，有FG∥PD，∵FG⊂AEB，PD⊄AEF，∴PD∥平面AEF．
