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V=10X6/2=30 特殊值法(適用於選擇題):別管他斜三棱柱,直接把他當成是底面直角三角形的棱柱來看,10=ah 6=b V=Sh=1/2.abh=10X6/2 大題畫圖計算,可能多些中間參數,最後結果肯定一樣的
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