如图,在多面体ABCDEF中,四边形ABCD是正方形,AB=2EF=2,EF∥AB,EF⊥FB,∠BFC=90°,BF=FC,H为BC的中点,
(Ⅰ)求证:FH∥平面EDB;
(Ⅱ)求证:AC⊥平面EDB;
(Ⅲ)求四面体B—DEF的体积
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如图,在多面体ABCDEF中,四边形ABCD是正方形,AB=2EF=2,EF∥AB,EF⊥FB,∠BFC=90°,BF=FC,H为BC的中点,
(Ⅰ)求证:FH∥平面EDB;
(Ⅱ)求证:AC⊥平面EDB;
(Ⅲ)求四面体B—DEF的体积