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先畫出圖 然後過B、C分別作x軸的垂線,垂足B',C' 則△ABC面積=直角梯形BCC'B'的面積-△BB'A面積-△CC'A面積 △ABC面積=(3+4)*4/2 - 4*3/2- 1*3/2 = 6.5
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