三角形ABC的面积是84平方厘米,D是BC边上的中点,且AC=14厘米,E为AC边上一点,DE=EC,求三角形ADE的面积
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![三角形ABC的面积是84平方厘米,D是BC边上的中点,且AC=14厘米,E为AC边上一点,DE=EC,求三角形ADE的面积](/uploads/image/z/1646577-9-7.jpg?t=%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%98%AF84%E5%B9%B3%E6%96%B9%E5%8E%98%E7%B1%B3%2CD%E6%98%AFBC%E8%BE%B9%E4%B8%8A%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E4%B8%94AC%3D14%E5%8E%98%E7%B1%B3%2CE%E4%B8%BAAC%E8%BE%B9%E4%B8%8A%E4%B8%80%E7%82%B9%2CDE%3DEC%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2ADE%E7%9A%84%E9%9D%A2%E7%A7%AF)
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