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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (100-10x)*(100+16x) ≥8000+1280x .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 100 - 10 * x ) * ( 100 + 16 * x ) ≥8000 + 1280 * x         (1)

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    From inequality(1)：
         -25/4 ≤ x ≤ 2

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    The final solution set is :
         -25/4 ≤ x ≤ 2

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