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給你畫圖了,首先ACB是鈍角,因為銳角算不出來. 從A點做BC的垂線,垂足為V 設PV=x,下麵一步步推倒就在圖上了.注意sprt是square ;root的縮寫,根號的意思,根號我不會打, 最後ACB為98.79度
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