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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (27.8-27)x+（25.8-24.4）（20-x） >20.5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 27.8 - 27 ) * x + ( 25.8 - 24.4 ) * ( 20 - x ) >20.5         (1)

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    From inequality(1)：
         x < 25/2

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    The final solution set is :
         x < 25/2

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