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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality a(120-a)-500-30a >1300 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a * ( 120 - a ) - 500 - 30 * a >1300         (1)

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    From inequality(1)：
         30 < a < 60

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    The final solution set is :
         30 < a < 60

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