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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -2000+500(1+r)^-1+700(1+r)^-2+2000(1+r)^-3 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -2000 + 500 * ( 1 + r ) ^ -1 + 700 * ( 1 + r ) ^ -2 + 2000 * ( 1 + r ) ^ -3 <0         (1)

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    From inequality(1)：
         r < -1 或  r ＞ 0.2152

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    The final solution set is :
         r < -1 或  r ＞ 0.2152

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