1.如图,三角形ABC中,角A=80度,点D,E,F分别在边AB,BC,CA上,且∠1=∠2,∠3=∠4,求∠DEF的度数图:http://hi.baidu.com/%B7%BF%D7%D3%B5%C4%C5%AF%C6%F8%BB%A8%BF%AA/album/item/2bb66f15f3182f3af724e401.html#2.在三角形ABC的顶点C作
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![1.如图,三角形ABC中,角A=80度,点D,E,F分别在边AB,BC,CA上,且∠1=∠2,∠3=∠4,求∠DEF的度数图:http://hi.baidu.com/%B7%BF%D7%D3%B5%C4%C5%AF%C6%F8%BB%A8%BF%AA/album/item/2bb66f15f3182f3af724e401.html#2.在三角形ABC的顶点C作](/uploads/image/z/595977-33-7.jpg?t=1.%E5%A6%82%E5%9B%BE%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%A7%92A%3D80%E5%BA%A6%2C%E7%82%B9D%2CE%2CF%E5%88%86%E5%88%AB%E5%9C%A8%E8%BE%B9AB%2CBC%2CCA%E4%B8%8A%2C%E4%B8%94%E2%88%A01%3D%E2%88%A02%2C%E2%88%A03%3D%E2%88%A04%2C%E6%B1%82%E2%88%A0DEF%E7%9A%84%E5%BA%A6%E6%95%B0%E5%9B%BE%EF%BC%9Ahttp%3A%2F%2Fhi.baidu.com%2F%25B7%25BF%25D7%25D3%25B5%25C4%25C5%25AF%25C6%25F8%25BB%25A8%25BF%25AA%2Falbum%2Fitem%2F2bb66f15f3182f3af724e401.html%232.%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E9%A1%B6%E7%82%B9C%E4%BD%9C)
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