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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 40-2x >2^(20-x) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        40 - 2 * x >2 ^ ( 20 - x )         (1)

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    From inequality(1)：
         18 < x < 19

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    The final solution set is :
         18 < x < 19

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