)如图所示,三棱柱ABC—A1B1C1中,AB=AC=AA1=2,面ABC1上面AAlClC,∠AAlCl=∠BAC1=
)如图所示,三棱柱ABC—A1B1C1中,AB=AC=AA1=2,面ABC1上面AAlClC,∠AAlCl=∠BAC1=600,AC1与A1C相交...
)如图所示,三棱柱ABC—A1B1C1中,AB=AC=AA1=2,面ABC1上面AAlClC,∠AAlCl=∠BAC1=600,AC1与A1C相交于0,E为BC的中点. (1)求证.OE∥面AAl BlB; (2)求证:B0⊥面AA1C1C; (3)求三棱锥C—AEC1的体积.