如图,点D,E分别在△ABC的边AB,AC上,DE∥BC.(1)若S△ADE=2,S△BCE=7.5,求S△BDE(2)若S△BDE=m,S△BCE=n,求S△ABC(用m,n表示)
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![如图,点D,E分别在△ABC的边AB,AC上,DE∥BC.(1)若S△ADE=2,S△BCE=7.5,求S△BDE(2)若S△BDE=m,S△BCE=n,求S△ABC(用m,n表示)](/uploads/image/z/3782763-27-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E7%82%B9D%2CE%E5%88%86%E5%88%AB%E5%9C%A8%E2%96%B3ABC%E7%9A%84%E8%BE%B9AB%2CAC%E4%B8%8A%2CDE%E2%88%A5BC.%EF%BC%881%EF%BC%89%E8%8B%A5S%E2%96%B3ADE%3D2%2CS%E2%96%B3BCE%3D7.5%2C%E6%B1%82S%E2%96%B3BDE%EF%BC%882%EF%BC%89%E8%8B%A5S%E2%96%B3BDE%3Dm%2CS%E2%96%B3BCE%3Dn%2C%E6%B1%82S%E2%96%B3ABC%EF%BC%88%E7%94%A8m%2Cn%E8%A1%A8%E7%A4%BA%EF%BC%89)
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