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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 225*1/a+a小于5000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        225 * 1 / a + a <5000         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         a < 0 或  a ＞ 0.045
    From inequality(2)：
         a < 0 或  a ＞ 0

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    From inequalities (1) and (2)
         a < 0 或  a ＞ 0.045    (3)

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    The final solution set is :
         a < 0 或  a ＞ 0.045
[ 2/2Inequality]
    Assignment:Find the solution set of inequality a大于0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a >0         (1)

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    From inequality(1)：
         a ＞ 0

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    The final solution set is :
         a ＞ 0

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