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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (x-60)(120-x) >= 500 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( x - 60 ) * ( 120 - x ) >= 500         (1)

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    From inequality(1)：
         70 ≤ x ≤ 110

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    The final solution set is :
         70 ≤ x ≤ 110

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