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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality a <10-a, .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a <10 - a ,         (1)

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    From inequality(1)：
         a < 5

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    The final solution set is :
         a < 5
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 25a+30(10-a) ≤285 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        25 * a + 30 * ( 10 - a ) ≤285         (1)

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    From inequality(1)：
         a ≥ 3

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    The final solution set is :
         a ≥ 3

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