如图①,延长△ABC的边BC到点D,使CD=2BC,连接DA,若△ACD的面积为S1,则S1 = (用的代数式表示);在如图12-1至图12-3中,△ABC的面积为a . (1)如图12-1,延长△ABC的边BC到点D,使CD=2BC,连结DA.若
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![如图①,延长△ABC的边BC到点D,使CD=2BC,连接DA,若△ACD的面积为S1,则S1 = (用的代数式表示);在如图12-1至图12-3中,△ABC的面积为a . (1)如图12-1,延长△ABC的边BC到点D,使CD=2BC,连结DA.若](/uploads/image/z/5203774-46-4.jpg?t=%E5%A6%82%E5%9B%BE%E2%91%A0%2C%E5%BB%B6%E9%95%BF%E2%96%B3ABC%E7%9A%84%E8%BE%B9BC%E5%88%B0%E7%82%B9D%2C%E4%BD%BFCD%3D2BC%2C%E8%BF%9E%E6%8E%A5DA%2C%E8%8B%A5%E2%96%B3ACD%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAS1%2C%E5%88%99S1+%3D+%28%E7%94%A8%E7%9A%84%E4%BB%A3%E6%95%B0%E5%BC%8F%E8%A1%A8%E7%A4%BA%29%EF%BC%9B%E5%9C%A8%E5%A6%82%E5%9B%BE12%EF%BC%8D1%E8%87%B3%E5%9B%BE12%EF%BC%8D3%E4%B8%AD%EF%BC%8C%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAa+%EF%BC%8E+%EF%BC%881%EF%BC%89%E5%A6%82%E5%9B%BE12%EF%BC%8D1%2C%E5%BB%B6%E9%95%BF%E2%96%B3ABC%E7%9A%84%E8%BE%B9BC%E5%88%B0%E7%82%B9D%EF%BC%8C%E4%BD%BFCD%3D2BC%EF%BC%8C%E8%BF%9E%E7%BB%93DA%EF%BC%8E%E8%8B%A5)
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