Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -20.5*k-0.5*k*k*(-41.5*k*k+2021.5*k-13120) >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -20.5 * k - 0.5 * k * k * ( -41.5 * k * k + 2021.5 * k - 13120 ) >0         (1)

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    From inequality(1)：
         k < 7.706993 或  k ＞ 41.000724

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    The final solution set is :
         k < 7.706993 或  k ＞ 41.000724

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