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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （x-20）（400-10x）小于等于8 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( x - 20 ) * ( 400 - 10 * x ) ≤8         (1)

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    From inequality(1)：
         x ≤ 20.04008 或  x ≥ 39.95992

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    The final solution set is :
         x ≤ 20.04008 或  x ≥ 39.95992

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