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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 8000-1800÷(1+r)*2 >300÷(1+r) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        8000 - 1800 ÷ ( 1 + r ) * 2 >300 ÷ ( 1 + r )         (1)

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    From inequality(1)：
         r < -1 或  r ＞ -41/80

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    The final solution set is :
         r < -1 或  r ＞ -41/80

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