已知△ABC的三内角A,B,C与所对的边a,b,c满足2b-c/a=cosC/cosA 1 、求角A的大小 2、如果用psinA,sinBsinC已知△ABC的三内角A,B,C与所对的边a,b,c满足2b-c/a=cosC/cosA1 、求角A的大小 2、如果用psinA,sinBsinC为长度
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![已知△ABC的三内角A,B,C与所对的边a,b,c满足2b-c/a=cosC/cosA 1 、求角A的大小 2、如果用psinA,sinBsinC已知△ABC的三内角A,B,C与所对的边a,b,c满足2b-c/a=cosC/cosA1 、求角A的大小 2、如果用psinA,sinBsinC为长度](/uploads/image/z/5502651-51-1.jpg?t=%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E4%B8%89%E5%86%85%E8%A7%92A%2CB%2CC%E4%B8%8E%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9a%2Cb%2Cc%E6%BB%A1%E8%B6%B32b-c%2Fa%3DcosC%2FcosA+1+%E3%80%81%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F+2%E3%80%81%E5%A6%82%E6%9E%9C%E7%94%A8psinA%2CsinBsinC%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E4%B8%89%E5%86%85%E8%A7%92A%2CB%2CC%E4%B8%8E%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9a%2Cb%2Cc%E6%BB%A1%E8%B6%B32b-c%2Fa%3DcosC%2FcosA1+%E3%80%81%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F+2%E3%80%81%E5%A6%82%E6%9E%9C%E7%94%A8psinA%2CsinBsinC%E4%B8%BA%E9%95%BF%E5%BA%A6)
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