(本小题满分12分)在几何体ABCDE中,∠BAC=,DC⊥平面ABC,EB⊥平面ABC,F是BC的中点,AB=AC=BE=2,CD=1(Ⅰ)求证:DC∥平面ABE;(Ⅱ)求证:AF⊥平面BCDE;(Ⅲ)求证:平面AFD⊥平面AFE.
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