Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 6000x+(40-x)4000 ≤20800 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        6000 * x + ( 40 - x ) * 4000 ≤20800         (1)

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    From inequality(1)：
         x ≤ -348/5

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    The final solution set is :
         x ≤ -348/5
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 1000x+800(40-x) ≥36000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1000 * x + 800 * ( 40 - x ) ≥36000         (1)

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    From inequality(1)：
         x ≥ 20

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    The final solution set is :
         x ≥ 20

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