关于正弦定理的1.在△ABC中,若根号3 a=2bsinA,则B=2.在△ABC中,计算a(sinB-sinC)+b(sinC-sinA)+c(sinA-sinB)的值.3.海上有A,B两个小岛相距10海里,从A岛观测C岛与B岛成60°的视角,从B岛观测A岛和C岛成75°的视角,
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![关于正弦定理的1.在△ABC中,若根号3 a=2bsinA,则B=2.在△ABC中,计算a(sinB-sinC)+b(sinC-sinA)+c(sinA-sinB)的值.3.海上有A,B两个小岛相距10海里,从A岛观测C岛与B岛成60°的视角,从B岛观测A岛和C岛成75°的视角,](/uploads/image/z/5274633-57-3.jpg?t=%E5%85%B3%E4%BA%8E%E6%AD%A3%E5%BC%A6%E5%AE%9A%E7%90%86%E7%9A%841.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E8%8B%A5%E6%A0%B9%E5%8F%B73+a%3D2bsinA%2C%E5%88%99B%3D2.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E8%AE%A1%E7%AE%97a%28sinB-sinC%29%2Bb%28sinC-sinA%29%2Bc%28sinA-sinB%29%E7%9A%84%E5%80%BC.3.%E6%B5%B7%E4%B8%8A%E6%9C%89A%2CB%E4%B8%A4%E4%B8%AA%E5%B0%8F%E5%B2%9B%E7%9B%B8%E8%B7%9D10%E6%B5%B7%E9%87%8C%2C%E4%BB%8EA%E5%B2%9B%E8%A7%82%E6%B5%8BC%E5%B2%9B%E4%B8%8EB%E5%B2%9B%E6%88%9060%C2%B0%E7%9A%84%E8%A7%86%E8%A7%92%2C%E4%BB%8EB%E5%B2%9B%E8%A7%82%E6%B5%8BA%E5%B2%9B%E5%92%8CC%E5%B2%9B%E6%88%9075%C2%B0%E7%9A%84%E8%A7%86%E8%A7%92%2C)
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