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可以先隨便假設其中3點共面(很簡單2點確定一條直線,直線和直線外一點可以確定1個平面)不防設A B C三點共面只需證明P點在這個平面上即可以下向量符號省去證明:PA=BA-BP=OA-OB-(OP-OB)=OA-OP= OA-(a向量OA+b向…
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