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如图,河流的两岸PQ、MN互相平行,河岸PQ上有一排小树,已知相邻两树之间的距离CD=40m,某人在河岸MN的A处测得∠DAN=35°,然后沿河岸走了100m到达B处,测得∠CBN=70°.求河流的宽度CE(精确到1m).(参考数据:sin35°≈0.57,cos35°≈0.82,tan35°≈0.70;sin 70°≈0.94,cos70°≈0.34,tan70°≈2.75).
△×△ =25 □+□+□=24 ☆× □=32
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