共50条信息
在四棱锥\(P-ABCD\)中,\(ABCD\)为平行四边形,\(AC\)与\(BD\)交于\(O\),\(G\)为\(BD\)上一点,\(BG=2GD\),\(\overrightarrow{PA}=a\),\(\overrightarrow{PB}=b\),\(\overrightarrow{PC}=c\),试用基底\(\{a,b,c\}\)表示向量\(\overrightarrow{PG}\).
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