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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (7-2a)(270＋60a) ≥1650 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 7 - 2 * a ) * ( 270 + 60 * a ) ≥1650         (1)

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    From inequality(1)：
         -2 ≤ a ≤ 1

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    The final solution set is :
         -2 ≤ a ≤ 1

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