Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （10000-2400-2500-4000）/x+10000/（x+20）+10000/x <1500 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 10000 - 2400 - 2500 - 4000 ) / x + 10000 / ( x + 20 ) + 10000 / x <1500         (1)
        From the definition field of divisor
        x ≠ 0        (2 )
        From the definition field of divisor
         x + 20 ≠ 0        (3 )
        From the definition field of divisor
        x ≠ 0        (4 )

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    From inequality(1)：
         x < -20 或  -15.488692 < x < 0 或  x ＞ 9.555358
    From inequality(2)：
         x < 0 或  x ＞ 0
    From inequality(3)：
         x < -20 或  x ＞ -20
    From inequality(4)：
         x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         x < -20 或  -15.488692 < x < 0 或  x ＞ 9.555358    (5)
    From inequalities (3) and (5)
         x < -20 或  -15.488692 < x < 0 或  x ＞ 9.555358    (6)
    From inequalities (4) and (6)
         x < -20 或  -15.488692 < x < 0 或  x ＞ 9.555358    (7)

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    The final solution set is :
         x < -20 或  -15.488692 < x < 0 或  x ＞ 9.555358

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