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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （x^2-18x-40）/5（100-5x） ≤0.8 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( x ^ 2 - 18 * x - 40 ) / 5 * ( 100 - 5 * x ) ≤0.8         (1)

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    From inequality(1)：
         x ≥ -2.001653

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    The final solution set is :
         x ≥ -2.001653

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