1.三角形的两边分别为5和3,他们夹角的余弦是方程5X^2-7X-6=0的根,则三角形的另一边长为.2.在三角形ABC中,已知a=2*根号下3,c=根号下6+根号下2,B=60°,则A=...3.在三角形ABC中,已知AB=4,AC=7,BC的中线AD=7/2,
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![1.三角形的两边分别为5和3,他们夹角的余弦是方程5X^2-7X-6=0的根,则三角形的另一边长为.2.在三角形ABC中,已知a=2*根号下3,c=根号下6+根号下2,B=60°,则A=...3.在三角形ABC中,已知AB=4,AC=7,BC的中线AD=7/2,](/uploads/image/z/13394487-39-7.jpg?t=1.%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E4%B8%A4%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BA5%E5%92%8C3%2C%E4%BB%96%E4%BB%AC%E5%A4%B9%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E6%98%AF%E6%96%B9%E7%A8%8B5X%5E2-7X-6%3D0%E7%9A%84%E6%A0%B9%2C%E5%88%99%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E5%8F%A6%E4%B8%80%E8%BE%B9%E9%95%BF%E4%B8%BA.2.%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5a%3D2%2A%E6%A0%B9%E5%8F%B7%E4%B8%8B3%2Cc%3D%E6%A0%B9%E5%8F%B7%E4%B8%8B6%2B%E6%A0%B9%E5%8F%B7%E4%B8%8B2%2CB%3D60%C2%B0%2C%E5%88%99A%3D...3.%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5AB%3D4%2CAC%3D7%2CBC%E7%9A%84%E4%B8%AD%E7%BA%BFAD%3D7%2F2%2C)
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