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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 8000(1+i)^2-7500(1+i)-1800 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        8000 * ( 1 + i ) ^ 2 - 7500 * ( 1 + i ) - 1800 >0         (1)

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    From inequality(1)：
         i < -1.198128 或  i ＞ 0.135628

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    The final solution set is :
         i < -1.198128 或  i ＞ 0.135628

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