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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 900n-100n^2 <2000(1.2^n-1) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        900 * n - 100 * n ^ 2 <2000 * ( 1.2 ^ n - 1 )         (1)

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    From inequality(1)：
         n < 0 或  n ＞ 3.761036

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    The final solution set is :
         n < 0 或  n ＞ 3.761036

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