如图1,三角形ABC中,DE平行BC分别交AB,AC于D,E两点,过点E作EF平行AB交BC于点F接上,已知若BF=a,FC=b,DE与BC间的距离为h,则S的平方=4S小1S小2(1)如图2,平行四边形DEFG的四个顶点在三角形ABC的三边上,若
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![如图1,三角形ABC中,DE平行BC分别交AB,AC于D,E两点,过点E作EF平行AB交BC于点F接上,已知若BF=a,FC=b,DE与BC间的距离为h,则S的平方=4S小1S小2(1)如图2,平行四边形DEFG的四个顶点在三角形ABC的三边上,若](/uploads/image/z/1352164-4-4.jpg?t=%E5%A6%82%E5%9B%BE1%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CDE%E5%B9%B3%E8%A1%8CBC%E5%88%86%E5%88%AB%E4%BA%A4AB%2CAC%E4%BA%8ED%2CE%E4%B8%A4%E7%82%B9%2C%E8%BF%87%E7%82%B9E%E4%BD%9CEF%E5%B9%B3%E8%A1%8CAB%E4%BA%A4BC%E4%BA%8E%E7%82%B9F%E6%8E%A5%E4%B8%8A%2C%E5%B7%B2%E7%9F%A5%E8%8B%A5BF%3Da%2CFC%3Db%2CDE%E4%B8%8EBC%E9%97%B4%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BAh%2C%E5%88%99S%E7%9A%84%E5%B9%B3%E6%96%B9%3D4S%E5%B0%8F1S%E5%B0%8F2%EF%BC%881%EF%BC%89%E5%A6%82%E5%9B%BE2%2C%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2DEFG%E7%9A%84%E5%9B%9B%E4%B8%AA%E9%A1%B6%E7%82%B9%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%89%E8%BE%B9%E4%B8%8A%2C%E8%8B%A5)
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