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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1.6x（30-2.5x） >= 128 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1.6 * x * ( 30 - 2.5 * x ) >= 128         (1)

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    From inequality(1)：
         4 ≤ x ≤ 8

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    The final solution set is :
         4 ≤ x ≤ 8

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