如图,河流两岸PQ,MN互相平行,河岸PQ上有一排小树,一直相邻两树之间的距离CD=50米,某人在河岸MN的A处测得∠DAN=35°,然后沿河岸走了120米到达B处,测得∠CBN=70°,求河流宽度CE.(结果保留两个有效
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![如图,河流两岸PQ,MN互相平行,河岸PQ上有一排小树,一直相邻两树之间的距离CD=50米,某人在河岸MN的A处测得∠DAN=35°,然后沿河岸走了120米到达B处,测得∠CBN=70°,求河流宽度CE.(结果保留两个有效](/uploads/image/z/4549044-12-4.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%B2%B3%E6%B5%81%E4%B8%A4%E5%B2%B8PQ%2CMN%E4%BA%92%E7%9B%B8%E5%B9%B3%E8%A1%8C%2C%E6%B2%B3%E5%B2%B8PQ%E4%B8%8A%E6%9C%89%E4%B8%80%E6%8E%92%E5%B0%8F%E6%A0%91%2C%E4%B8%80%E7%9B%B4%E7%9B%B8%E9%82%BB%E4%B8%A4%E6%A0%91%E4%B9%8B%E9%97%B4%E7%9A%84%E8%B7%9D%E7%A6%BBCD%3D50%E7%B1%B3%2C%E6%9F%90%E4%BA%BA%E5%9C%A8%E6%B2%B3%E5%B2%B8MN%E7%9A%84A%E5%A4%84%E6%B5%8B%E5%BE%97%E2%88%A0DAN%3D35%C2%B0%2C%E7%84%B6%E5%90%8E%E6%B2%BF%E6%B2%B3%E5%B2%B8%E8%B5%B0%E4%BA%86120%E7%B1%B3%E5%88%B0%E8%BE%BEB%E5%A4%84%2C%E6%B5%8B%E5%BE%97%E2%88%A0CBN%3D70%C2%B0%2C%E6%B1%82%E6%B2%B3%E6%B5%81%E5%AE%BD%E5%BA%A6CE.%EF%BC%88%E7%BB%93%E6%9E%9C%E4%BF%9D%E7%95%99%E4%B8%A4%E4%B8%AA%E6%9C%89%E6%95%88)
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