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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality {20x-30（100-x） ) ≤280040x-20（100-x） ≤2800 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
         ( 20 * x - 30 * ( 100 - x ) ) ≤280040 * x - 20 * ( 100 - x )         (1)
        280040 * x - 20 * ( 100 - x ) ≤2800         (2)

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    From inequality(1)：
         x ≥ -0.003571
    From inequality(2)：
         x ≤ 0.017139

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    From inequalities (1) and (2)
         -0.003571 ≤ x ≤ 0.017139    (3)

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    The final solution set is :
         -0.003571 ≤ x ≤ 0.017139

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