如图,在三角形ABC中,A,B,C三点的坐标分别是(2,啊),(5,2),(1,-1),则三角形ABC的面积是多少.
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![如图,在三角形ABC中,A,B,C三点的坐标分别是(2,啊),(5,2),(1,-1),则三角形ABC的面积是多少.](/uploads/image/z/588603-3-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CA%2CB%2CC%E4%B8%89%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E6%98%AF%EF%BC%882%2C%E5%95%8A%EF%BC%89%2C%285%2C2%29%2C%281%2C-1%EF%BC%89%2C%E5%88%99%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%98%AF%E5%A4%9A%E5%B0%91.)
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