数学题在四棱锥P-ABCD中,AB⊥平面PAD,AB∥CD,PD=CD……如图所示,在四棱锥P-ABCD中,AB⊥平面PAD,AB∥CD,PD=AD,E是PB的中点,F是DC上的点,且DF=1/2AB,PH为三角形PAD边上的高 证明1)PH⊥平
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