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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 1/x+x >20 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 / x + x >20         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         0 < x < 0.050126 或  x ＞ 19.949874
    From inequality(2)：
         x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         0 < x < 0.050126 或  x ＞ 19.949874    (3)

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    The final solution set is :
         0 < x < 0.050126 或  x ＞ 19.949874
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 1/x+x <40 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 / x + x <40         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         x < 0 或  0.025016 < x < 39.974984
    From inequality(2)：
         x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         x < 0 或  0.025016 < x < 39.974984     (3)

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    The final solution set is :
         x < 0 或  0.025016 < x < 39.974984

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