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a*(根號2)/2 連接A1C,過A做A1C垂線,交A1C於H; BC垂直於ACA1平面,BC垂直於AH,AH垂直A1C;所以,AH垂直於平面A1BC 所以AH就是點A到平面A1BC的距離,為a*(根號2)/2
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