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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality abs(600-40x) >= 180 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         abs ( 600 - 40 * x ) >= 180         (1)

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    From inequality(1)：
         x ≤ 21/2 或  x ≥ 39/2

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    The final solution set is :
         x ≤ 21/2 或  x ≥ 39/2

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