已知函数f(x)=ax-6/x2+b在点M(-1,f(-1))处的切线方程为x+2y+5=0,求f(x)在区间[6,7]上取最大值与最小值时的x
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![已知函数f(x)=ax-6/x2+b在点M(-1,f(-1))处的切线方程为x+2y+5=0,求f(x)在区间[6,7]上取最大值与最小值时的x](/uploads/image/z/15065598-30-8.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dax-6%2Fx2%2Bb%E5%9C%A8%E7%82%B9M%28-1%2Cf%28-1%29%29%E5%A4%84%E7%9A%84%E5%88%87%E7%BA%BF%E6%96%B9%E7%A8%8B%E4%B8%BAx%2B2y%2B5%3D0%2C%E6%B1%82f%28x%29%E5%9C%A8%E5%8C%BA%E9%97%B4%5B6%2C7%5D%E4%B8%8A%E5%8F%96%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%8E%E6%9C%80%E5%B0%8F%E5%80%BC%E6%97%B6%E7%9A%84x)
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