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下面是一道中学数学教师综合素质笔试题,要求至少用三种解法解答并作简要分析,我认真整理出八种解法,现提供给读者,与君共享,仅供参考.试题如图1,MN是海岸线l上长为1海里的码头,A是海岸线上一个观测站.且M距离观测站A有19.5海里.在A处观测到北偏西30°方向且与A相距40海里的海平面上B处有一艘轮船,上午8时正往位于A的北偏东60°方向且与A相距83~(1/2)海里的一小岛C航行,9点20分到达小岛C,求:
The following is a high school mathematics teacher comprehensive quality test questions, requiring at least three solutions to answer and make a brief analysis, I carefully sorted out eight solutions, are available to readers, and Jun share, for reference only. Test questions shown in Figure 1, MN Is a 1-mile-long marina on coastline l and A is an observation station on the coastline and M is 19.5 nautical miles from observation station A. A sea level of 40 nautical miles north and west of 30 ° is observed at A At 8:00 a.m., at 8:00 a.m. it was sailing to an islet C which was located at 60 ° north and east of A and 83 to (1/2) nautical miles from A and reached the islet C at 9:20 h, seeking: