问一道高中数学解三角形的题已知△ABC的三边长a=3,b=5,c=6,则△ABC的面积是( )A,根号14 B,二分之根号14 C ,根号15 D,二分之根号15理论上来说是先用余弦定理求出一个角,然后用面积公式求,但是
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![问一道高中数学解三角形的题已知△ABC的三边长a=3,b=5,c=6,则△ABC的面积是( )A,根号14 B,二分之根号14 C ,根号15 D,二分之根号15理论上来说是先用余弦定理求出一个角,然后用面积公式求,但是](/uploads/image/z/11611165-13-5.jpg?t=%E9%97%AE%E4%B8%80%E9%81%93%E9%AB%98%E4%B8%AD%E6%95%B0%E5%AD%A6%E8%A7%A3%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E9%A2%98%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E4%B8%89%E8%BE%B9%E9%95%BFa%3D3%2Cb%3D5%2Cc%3D6%2C%E5%88%99%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%98%AF%EF%BC%88+%EF%BC%89A%2C%E6%A0%B9%E5%8F%B714+B%2C%E4%BA%8C%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B714+C+%2C%E6%A0%B9%E5%8F%B715+D%2C%E4%BA%8C%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B715%E7%90%86%E8%AE%BA%E4%B8%8A%E6%9D%A5%E8%AF%B4%E6%98%AF%E5%85%88%E7%94%A8%E4%BD%99%E5%BC%A6%E5%AE%9A%E7%90%86%E6%B1%82%E5%87%BA%E4%B8%80%E4%B8%AA%E8%A7%92%2C%E7%84%B6%E5%90%8E%E7%94%A8%E9%9D%A2%E7%A7%AF%E5%85%AC%E5%BC%8F%E6%B1%82%2C%E4%BD%86%E6%98%AF)
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