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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.25*30^(1-x)+0.75*60^(1-x) >40^(1-x) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.25 * 30 ^ ( 1 - x ) + 0.75 * 60 ^ ( 1 - x ) >40 ^ ( 1 - x )         (1)

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    From inequality(1)：
         x < 1 或  x ＞ 5338069/1000000

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    The final solution set is :
         x < 1 或  x ＞ 5338069/1000000

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