如图,在直角梯形ABCD中,∠A=∠B=90°,AD=3,BC=6,AB=m(m>3),ED⊥CD且交AB于点E(1)试判断△DCE与△ADE、△DCE与△BCE是否一定相似?(2)如果相似请证明;如果不一定相似,请指出当m为何值时,它们才能
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![如图,在直角梯形ABCD中,∠A=∠B=90°,AD=3,BC=6,AB=m(m>3),ED⊥CD且交AB于点E(1)试判断△DCE与△ADE、△DCE与△BCE是否一定相似?(2)如果相似请证明;如果不一定相似,请指出当m为何值时,它们才能](/uploads/image/z/11653893-45-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0A%3D%E2%88%A0B%3D90%C2%B0%2CAD%3D3%2CBC%3D6%2CAB%3Dm%28m%26gt%3B3%29%2CED%E2%8A%A5CD%E4%B8%94%E4%BA%A4AB%E4%BA%8E%E7%82%B9E%EF%BC%881%EF%BC%89%E8%AF%95%E5%88%A4%E6%96%AD%E2%96%B3DCE%E4%B8%8E%E2%96%B3ADE%E3%80%81%E2%96%B3DCE%E4%B8%8E%E2%96%B3BCE%E6%98%AF%E5%90%A6%E4%B8%80%E5%AE%9A%E7%9B%B8%E4%BC%BC%3F%EF%BC%882%EF%BC%89%E5%A6%82%E6%9E%9C%E7%9B%B8%E4%BC%BC%E8%AF%B7%E8%AF%81%E6%98%8E%EF%BC%9B%E5%A6%82%E6%9E%9C%E4%B8%8D%E4%B8%80%E5%AE%9A%E7%9B%B8%E4%BC%BC%2C%E8%AF%B7%E6%8C%87%E5%87%BA%E5%BD%93m%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%AE%83%E4%BB%AC%E6%89%8D%E8%83%BD)
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