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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (300-6*x)*(280+7*x) >480*125 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 300 - 6 * x ) * ( 280 + 7 * x ) >480 * 125         (1)

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    From inequality(1)：
         -19.421887 < x < 29.421887

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    The final solution set is :
         -19.421887 < x < 29.421887

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