关于数学正余弦定理的综合运用在△ABC中,若2b=a+c.求证:2cos A+C/2=cos A—C/2 ( “/"代表分数线)“ 我是裘春” 不会就别回答.浪费.
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![关于数学正余弦定理的综合运用在△ABC中,若2b=a+c.求证:2cos A+C/2=cos A—C/2 ( “/](/uploads/image/z/11475512-8-2.jpg?t=%E5%85%B3%E4%BA%8E%E6%95%B0%E5%AD%A6%E6%AD%A3%E4%BD%99%E5%BC%A6%E5%AE%9A%E7%90%86%E7%9A%84%E7%BB%BC%E5%90%88%E8%BF%90%E7%94%A8%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E8%8B%A52b%3Da%2Bc.%E6%B1%82%E8%AF%81%EF%BC%9A2cos+A%2BC%2F2%3Dcos+A%E2%80%94C%2F2+%EF%BC%88+%E2%80%9C%2F%22%E4%BB%A3%E8%A1%A8%E5%88%86%E6%95%B0%E7%BA%BF%EF%BC%89%E2%80%9C+%E6%88%91%E6%98%AF%E8%A3%98%E6%98%A5%E2%80%9D+%E4%B8%8D%E4%BC%9A%E5%B0%B1%E5%88%AB%E5%9B%9E%E7%AD%94.%E6%B5%AA%E8%B4%B9.)
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