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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (139.8-1/(4*a))/(150*a-1/(600*a)) >= -0.5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 139.8 - 1 / ( 4 * a ) ) / ( 150 * a - 1 / ( 600 * a ) ) >= -0.5         (1)
        From the definition field of divisor
         4 * x ≠ 0        (2 )
        From the definition field of divisor
         600 * x ≠ 0        (3 )
        From the definition field of divisor
         150 * x - 1 / ( 600 * x ) ≠ 0        (4 )

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    From inequality(1)：
         a ≤ -1.865793 或  a ≥ -0.003333
    From inequality(2)：
         a < 0 或  a ＞ 0
    From inequality(3)：
         a < 0 或  a ＞ 0
    From inequality(4)：
         a < 1/300 或  a ＞ 1/300

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    From inequalities (1) and (2)
         a ≤ -1.865793 或  -0.003333 ≤ a < 0 或  a ＞ 0    (5)
    From inequalities (3) and (5)
         a ≤ -1.865793 或  -0.003333 ≤ a < 0 或  a ＞ 0    (6)
    From inequalities (4) and (6)
         a ≤ -1.865793 或  -0.003333 ≤ a < 0 或  0 < a < 1/300 或  a ＞ 1/300    (7)

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    The final solution set is :
         a ≤ -1.865793 或  -0.003333 ≤ a < 0 或  0 < a < 1/300 或  a ＞ 1/300

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