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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1-0.8^(n)-0.2*n*0.8^(n-1) >= 0.9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 - 0.8 ^ ( n ) - 0.2 * n * 0.8 ^ ( n - 1 ) >= 0.9         (1)

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    From inequality(1)：
         n ≤ -3.829819 或  n ≥ √322127933/1000

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    The final solution set is :
         n ≤ -3.829819 或  n ≥ √322127933/1000

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