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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 1800*a+1400*(10-a) ≤11800 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1800 * a + 1400 * ( 10 - a ) ≤11800         (1)

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    From inequality(1)：
         a ≤ -11/2

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    The final solution set is :
         a ≤ -11/2
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 300*a+500*(10-a) ≥4000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        300 * a + 500 * ( 10 - a ) ≥4000         (1)

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    From inequality(1)：
         a ≤ 5

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    The final solution set is :
         a ≤ 5

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