If the bottom of p-abcd is a parallelogram, the bottom of PA ⊥ is ABCD, the point E is on the side edge PC, and PE = 13pc, then VP − bdevp − ABCD=______ ．

Let the area of parallelogram ABCD be s, the height of pyramid p-abcd be h, ∵ PA ⊥ plane ABCD, ∵ PA = H.S △ abd = s △ BCD = 12s, ∵ PE = 13pc, the height of pyramid e-bcd be 23h, ∵ vp-bde = vp-abcd-vp-abd-ve-bcd = 13sh-13 × 12sh-13 × 23h × 12s = (13 − 16 − 19

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