正三角形ABC的边长为a,点P Q R分别为边BC.CA.AB上的点 且满足BP+CQ+AR=a(1)求三角形PQR面积S(x y z)的表达式(2)求S(X Y Z)的最大值
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![正三角形ABC的边长为a,点P Q R分别为边BC.CA.AB上的点 且满足BP+CQ+AR=a(1)求三角形PQR面积S(x y z)的表达式(2)求S(X Y Z)的最大值](/uploads/image/z/6694290-18-0.jpg?t=%E6%AD%A3%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E8%BE%B9%E9%95%BF%E4%B8%BAa%2C%E7%82%B9P+Q+R%E5%88%86%E5%88%AB%E4%B8%BA%E8%BE%B9BC.CA.AB%E4%B8%8A%E7%9A%84%E7%82%B9+%E4%B8%94%E6%BB%A1%E8%B6%B3BP%2BCQ%2BAR%3Da%EF%BC%881%EF%BC%89%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2PQR%E9%9D%A2%E7%A7%AFS%EF%BC%88x+y+z%EF%BC%89%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F%EF%BC%882%EF%BC%89%E6%B1%82S%28X+Y+Z%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC)
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