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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1 >(1-x/40)(1-x/80) >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        1 > ( 1 - x / 40 ) * ( 1 - x / 80 )         (1)
         ( 1 - x / 40 ) * ( 1 - x / 80 ) >0         (2)

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    From inequality(1)：
         0 < x < 120
    From inequality(2)：
         x < 40 或  x ＞ 80

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    From inequalities (1) and (2)
         0 < x < 40 或  80 < x < 120     (3)

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    The final solution set is :
         0 < x < 40 或  80 < x < 120

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