如图ABCD中,AB=AD,BC=DC! 分别在AB,AD的中点E,F处拉两根红线EC,FC,证明:这两根红线的长相等!
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![如图ABCD中,AB=AD,BC=DC! 分别在AB,AD的中点E,F处拉两根红线EC,FC,证明:这两根红线的长相等!](/uploads/image/z/5471861-5-1.jpg?t=%E5%A6%82%E5%9B%BEABCD%E4%B8%AD%EF%BC%8CAB%3DAD%2CBC%3DDC%21+++++++%E5%88%86%E5%88%AB%E5%9C%A8AB%2CAD%E7%9A%84%E4%B8%AD%E7%82%B9E%2CF%E5%A4%84%E6%8B%89%E4%B8%A4%E6%A0%B9%E7%BA%A2%E7%BA%BFEC%2CFC%2C%E8%AF%81%E6%98%8E%EF%BC%9A%E8%BF%99%E4%B8%A4%E6%A0%B9%E7%BA%A2%E7%BA%BF%E7%9A%84%E9%95%BF%E7%9B%B8%E7%AD%89%EF%BC%81)
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