如图:在△ABC中,BC=1,(1)若AD1=1/3AB,AE1=1/3AC,则D1E1= (2)若D1D2=1/3D1B,E1E2=1/3E1C,则D2E2=如图:在△ABC中,BC=a,(1)若AD1=1/3AB,AE1=1/3AC,则D1E1= (2)若D1D2=1/3D1B,E1E2=1/3E1C,则D2E2= (3)若D2D3=1/3D2B,E2E3=1/3E2C
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![如图:在△ABC中,BC=1,(1)若AD1=1/3AB,AE1=1/3AC,则D1E1= (2)若D1D2=1/3D1B,E1E2=1/3E1C,则D2E2=如图:在△ABC中,BC=a,(1)若AD1=1/3AB,AE1=1/3AC,则D1E1= (2)若D1D2=1/3D1B,E1E2=1/3E1C,则D2E2= (3)若D2D3=1/3D2B,E2E3=1/3E2C](/uploads/image/z/5482839-39-9.jpg?t=%E5%A6%82%E5%9B%BE%EF%BC%9A%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CBC%3D1%2C%EF%BC%881%EF%BC%89%E8%8B%A5AD1%3D1%2F3AB%2CAE1%3D1%2F3AC%2C%E5%88%99D1E1%3D+%EF%BC%882%EF%BC%89%E8%8B%A5D1D2%3D1%2F3D1B%2CE1E2%3D1%2F3E1C%2C%E5%88%99D2E2%3D%E5%A6%82%E5%9B%BE%EF%BC%9A%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CBC%3Da%2C%EF%BC%881%EF%BC%89%E8%8B%A5AD1%3D1%2F3AB%2CAE1%3D1%2F3AC%2C%E5%88%99D1E1%3D+%EF%BC%882%EF%BC%89%E8%8B%A5D1D2%3D1%2F3D1B%2CE1E2%3D1%2F3E1C%2C%E5%88%99D2E2%3D+%EF%BC%883%EF%BC%89%E8%8B%A5D2D3%3D1%2F3D2B%2CE2E3%3D1%2F3E2C)
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