1.在△ABC中,S△=15√3,且周长为30,A+C=B/2,求三边长.2.在△ABC中,角A,B,C的对边分别为a,b,c,已知a+c=10,C=2A,cosA=3/4.求c/a的值,和b的长.
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![1.在△ABC中,S△=15√3,且周长为30,A+C=B/2,求三边长.2.在△ABC中,角A,B,C的对边分别为a,b,c,已知a+c=10,C=2A,cosA=3/4.求c/a的值,和b的长.](/uploads/image/z/10472369-41-9.jpg?t=1.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CS%E2%96%B3%3D15%E2%88%9A3%2C%E4%B8%94%E5%91%A8%E9%95%BF%E4%B8%BA30%2CA%2BC%3DB%2F2%2C%E6%B1%82%E4%B8%89%E8%BE%B9%E9%95%BF.2.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E8%A7%92A%2CB%2CC%E7%9A%84%E5%AF%B9%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAa%2Cb%2Cc%2C%E5%B7%B2%E7%9F%A5a%2Bc%3D10%2CC%3D2A%2CcosA%3D3%2F4.%E6%B1%82c%2Fa%E7%9A%84%E5%80%BC%2C%E5%92%8Cb%E7%9A%84%E9%95%BF.)
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