已知三角形3角一边,求另外两边已知三角形ABC(钝角),三角分别为a,b,c和边BC长,求,AB,AC的长?发带图的数学公式,不要写成如:(a^2=b^2+c^2-2*b*c*cosA b^2=a^2+c^2-2*a*c*cosB c^2=a^2+b^2-2*a*b*cosC)
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![已知三角形3角一边,求另外两边已知三角形ABC(钝角),三角分别为a,b,c和边BC长,求,AB,AC的长?发带图的数学公式,不要写成如:(a^2=b^2+c^2-2*b*c*cosA b^2=a^2+c^2-2*a*c*cosB c^2=a^2+b^2-2*a*b*cosC)](/uploads/image/z/12512096-8-6.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A23%E8%A7%92%E4%B8%80%E8%BE%B9%2C%E6%B1%82%E5%8F%A6%E5%A4%96%E4%B8%A4%E8%BE%B9%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%EF%BC%88%E9%92%9D%E8%A7%92%EF%BC%89%2C%E4%B8%89%E8%A7%92%E5%88%86%E5%88%AB%E4%B8%BAa%2Cb%2Cc%E5%92%8C%E8%BE%B9BC%E9%95%BF%2C%E6%B1%82%2CAB%2CAC%E7%9A%84%E9%95%BF%3F%E5%8F%91%E5%B8%A6%E5%9B%BE%E7%9A%84%E6%95%B0%E5%AD%A6%E5%85%AC%E5%BC%8F%2C%E4%B8%8D%E8%A6%81%E5%86%99%E6%88%90%E5%A6%82%EF%BC%9A%EF%BC%88a%5E2%3Db%5E2%2Bc%5E2-2%2Ab%2Ac%2AcosA+b%5E2%3Da%5E2%2Bc%5E2-2%2Aa%2Ac%2AcosB+c%5E2%3Da%5E2%2Bb%5E2-2%2Aa%2Ab%2AcosC%EF%BC%89)
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