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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 13.11-0.2x <= 20 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        13.11 - 0.2 * x <= 20         (1)

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    From inequality(1)：
         x ≥ -689/20

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    The final solution set is :
         x ≥ -689/20

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