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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （m-30)(40-m+40) >= 525 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( m - 30 ) * ( 40 - m + 40 ) >= 525         (1)

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    From inequality(1)：
         45 ≤ m ≤ 65

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    The final solution set is :
         45 ≤ m ≤ 65

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