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北區模考非選第二題 (2014.03.06)

Autor:羅驥韡 (Pegasus Roe)
圖為正立方體，Q(-1,0,1)、R(3,-1,2) 為中點，P(0,-4,2) 為中心點，F(-1,-3,7) 為一頂點，求 G 點座標。

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