几何向量,线性约束条件,指数运算.说已知P是△ABC内一点,且满足(向量)PA+2PB+3PC=0,记△ABP、△BCP、△ACP的面积依次为S1、S2、S3,则S1:S2:S3等于?由(向量)PA+2PB+3PC=0,得(向量)PA+PC=-2(PB+PC)

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