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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (40+x)(20-2x) ≥637.5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 40 + x ) * ( 20 - 2 * x ) ≥637.5         (1)

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    From inequality(1)：
         -65/2 ≤ x ≤ 5/2

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    The final solution set is :
         -65/2 ≤ x ≤ 5/2

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