f(x)=x^2-x+1/x-3 求导
f(x)的导数为2X-1-1/(X^2)
当X＝1时,f(x)的导数为0,函数取极小值
f(x)=x^2-x+1/x-3的最小值为-2能在清楚一点吗，导数是什么
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