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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 15a ≤4×（396-a） .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        15 * a ≤4 × ( 396 - a )         (1)

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    From inequality(1)：
         a ≤ 83.368421

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    The final solution set is :
         a ≤ 83.368421
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 15a+4（396-a） ≤2700 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        15 * a + 4 * ( 396 - a ) ≤2700         (1)

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    From inequality(1)：
         a ≤ 1116/11

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    The final solution set is :
         a ≤ 1116/11

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