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向量GA=向量OA-向量OG向量GB=向量OB-向量OG向量GC=向量OG-向量OC 向量GA+向量GB+向量GC=向量OA-向量OG+向量OB-向量OG+向量OC-向量OG=0向量 3向量OG=向量OA+向量OB+向量PC好了
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