一船在海上由西向东航行,在A处测得某岛M的方位角为北偏东a角,前进4km后在B处测得该岛的方位为北偏东b角,已知该岛周围3.5km范围有暗礁,现该船继续东行.1)若a=2b=60度,该船有没有触礁危险?如
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![一船在海上由西向东航行,在A处测得某岛M的方位角为北偏东a角,前进4km后在B处测得该岛的方位为北偏东b角,已知该岛周围3.5km范围有暗礁,现该船继续东行.1)若a=2b=60度,该船有没有触礁危险?如](/uploads/image/z/14938688-56-8.jpg?t=%E4%B8%80%E8%88%B9%E5%9C%A8%E6%B5%B7%E4%B8%8A%E7%94%B1%E8%A5%BF%E5%90%91%E4%B8%9C%E8%88%AA%E8%A1%8C%2C%E5%9C%A8A%E5%A4%84%E6%B5%8B%E5%BE%97%E6%9F%90%E5%B2%9BM%E7%9A%84%E6%96%B9%E4%BD%8D%E8%A7%92%E4%B8%BA%E5%8C%97%E5%81%8F%E4%B8%9Ca%E8%A7%92%2C%E5%89%8D%E8%BF%9B4km%E5%90%8E%E5%9C%A8B%E5%A4%84%E6%B5%8B%E5%BE%97%E8%AF%A5%E5%B2%9B%E7%9A%84%E6%96%B9%E4%BD%8D%E4%B8%BA%E5%8C%97%E5%81%8F%E4%B8%9Cb%E8%A7%92%2C%E5%B7%B2%E7%9F%A5%E8%AF%A5%E5%B2%9B%E5%91%A8%E5%9B%B43.5km%E8%8C%83%E5%9B%B4%E6%9C%89%E6%9A%97%E7%A4%81%2C%E7%8E%B0%E8%AF%A5%E8%88%B9%E7%BB%A7%E7%BB%AD%E4%B8%9C%E8%A1%8C.1%EF%BC%89%E8%8B%A5a%3D2b%3D60%E5%BA%A6%2C%E8%AF%A5%E8%88%B9%E6%9C%89%E6%B2%A1%E6%9C%89%E8%A7%A6%E7%A4%81%E5%8D%B1%E9%99%A9%3F%E5%A6%82)
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