在图中,△ABC的面积为a:(1)如图,延长△ABC的边BC到点D,延长边CA到点E,延长边AB到点F,使CD=2BC,AE=2CA,BF=2AB,连结DE,FD,FE,得到△DEF,若阴影部分的面积为S1,则S1=( )(用含a 的代数式表示)(2)如
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![在图中,△ABC的面积为a:(1)如图,延长△ABC的边BC到点D,延长边CA到点E,延长边AB到点F,使CD=2BC,AE=2CA,BF=2AB,连结DE,FD,FE,得到△DEF,若阴影部分的面积为S1,则S1=( )(用含a 的代数式表示)(2)如](/uploads/image/z/453950-62-0.jpg?t=%E5%9C%A8%E5%9B%BE%E4%B8%AD%2C%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAa%EF%BC%9A%EF%BC%881%EF%BC%89%E5%A6%82%E5%9B%BE%2C%E5%BB%B6%E9%95%BF%E2%96%B3ABC%E7%9A%84%E8%BE%B9BC%E5%88%B0%E7%82%B9D%2C%E5%BB%B6%E9%95%BF%E8%BE%B9CA%E5%88%B0%E7%82%B9E%2C%E5%BB%B6%E9%95%BF%E8%BE%B9AB%E5%88%B0%E7%82%B9F%2C%E4%BD%BFCD%3D2BC%2CAE%3D2CA%2CBF%3D2AB%2C%E8%BF%9E%E7%BB%93DE%2CFD%2CFE%2C%E5%BE%97%E5%88%B0%E2%96%B3DEF%2C%E8%8B%A5%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAS1%2C%E5%88%99S1%3D%EF%BC%88+%EF%BC%89%EF%BC%88%E7%94%A8%E5%90%ABa+%E7%9A%84%E4%BB%A3%E6%95%B0%E5%BC%8F%E8%A1%A8%E7%A4%BA%EF%BC%89%EF%BC%882%EF%BC%89%E5%A6%82)
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