如图,已知:AB//CD 求证:角E=角A+角C
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![如图,已知:AB//CD 求证:角E=角A+角C](/uploads/image/z/970163-35-3.jpg?t=%E5%A6%82%E5%9B%BE%EF%BC%8C%E5%B7%B2%E7%9F%A5%EF%BC%9AAB%2F%2FCD+%E6%B1%82%E8%AF%81%EF%BC%9A%E8%A7%92E%3D%E8%A7%92A%2B%E8%A7%92C)
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