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

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

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    From inequality(1)：
         x < -19.976822 或  x ＞ √78046949/√500000

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    The final solution set is :
         x < -19.976822 或  x ＞ √78046949/√500000

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