设二次函数f(x)=ax-4x+c﹝x∈R﹞的值域为[0,正无穷大﹚,则[1/﹙c+1﹚]+[9/﹙a+9﹚]的最大值是多少?A .31/25 B .6/5 C .38/33 D .31 /26求解,
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![设二次函数f(x)=ax-4x+c﹝x∈R﹞的值域为[0,正无穷大﹚,则[1/﹙c+1﹚]+[9/﹙a+9﹚]的最大值是多少?A .31/25 B .6/5 C .38/33 D .31 /26求解,](/uploads/image/z/2553690-66-0.jpg?t=%E8%AE%BE%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%28x%29%3Dax-4x%2Bc%EF%B9%9Dx%E2%88%88R%EF%B9%9E%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BA%5B0%2C%E6%AD%A3%E6%97%A0%E7%A9%B7%E5%A4%A7%EF%B9%9A%2C%E5%88%99%5B1%2F%EF%B9%99c%2B1%EF%B9%9A%5D%2B%5B9%2F%EF%B9%99a%2B9%EF%B9%9A%5D%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3FA+.31%2F25+B+.6%2F5+C+.38%2F33+D+.31+%2F26%E6%B1%82%E8%A7%A3%2C)
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