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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （70-50）a+（40-30）（80-a） ≥1300 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 70 - 50 ) * a + ( 40 - 30 ) * ( 80 - a ) ≥1300         (1)

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    From inequality(1)：
         a ≥ 50

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    The final solution set is :
         a ≥ 50

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