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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3×800+80(x－9) >0.8(3×800+80x) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        3 × 800 + 80 * ( x - 9 ) >0.8 * ( 3 × 800 + 80 * x )         (1)

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    From inequality(1)：
         x ＞ 15

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    The final solution set is :
         x ＞ 15

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