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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 80(1+r)^2 >75(1+r)+18 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        80 * ( 1 + r ) ^ 2 >75 * ( 1 + r ) + 18         (1)

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

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

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