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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (70-60)*100+(65-x-50)*80 >= 1800 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 70 - 60 ) * 100 + ( 65 - x - 50 ) * 80 >= 1800         (1)

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    From inequality(1)：
         x ≤ 5

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    The final solution set is :
         x ≤ 5

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