急求该几何题解答过程在直角梯形ABCD中,AB‖DC,∠B=∠C=90°,E、F是BC上两点,若AD=ED,∠ADE=30°,∠FDC=15°.下列结论是否成立:2(AB-CF)=EF. SΔDAF:SΔDEF=AF:EF
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![急求该几何题解答过程在直角梯形ABCD中,AB‖DC,∠B=∠C=90°,E、F是BC上两点,若AD=ED,∠ADE=30°,∠FDC=15°.下列结论是否成立:2(AB-CF)=EF. SΔDAF:SΔDEF=AF:EF](/uploads/image/z/5335704-0-4.jpg?t=%E6%80%A5%E6%B1%82%E8%AF%A5%E5%87%A0%E4%BD%95%E9%A2%98%E8%A7%A3%E7%AD%94%E8%BF%87%E7%A8%8B%E5%9C%A8%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAB%E2%80%96DC%2C%E2%88%A0B%3D%E2%88%A0C%3D90%C2%B0%2CE%E3%80%81F%E6%98%AFBC%E4%B8%8A%E4%B8%A4%E7%82%B9%2C%E8%8B%A5AD%3DED%2C%E2%88%A0ADE%3D30%C2%B0%2C%E2%88%A0FDC%3D15%C2%B0.%E4%B8%8B%E5%88%97%E7%BB%93%E8%AE%BA%E6%98%AF%E5%90%A6%E6%88%90%E7%AB%8B%EF%BC%9A2%EF%BC%88AB-CF%EF%BC%89%3DEF.+S%CE%94DAF%EF%BC%9AS%CE%94DEF%3DAF%EF%BC%9AEF)
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