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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1/（1-x）+1/（1-1.2x）+1/（1-1.5x） >39 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 / ( 1 - x ) + 1 / ( 1 - 1.2 * x ) + 1 / ( 1 - 1.5 * x ) >39         (1)
        From the definition field of divisor
         1 - x ≠ 0        (2 )
        From the definition field of divisor
         1 - 1.2 * x ≠ 0        (3 )
        From the definition field of divisor
         1 - 1.5 * x ≠ 0        (4 )

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    From inequality(1)：
         0.645661 < x < 0.666667
    From inequality(2)：
         x < 1 或  x ＞ 1
    From inequality(3)：
         x < 5/6 或  x ＞ 5/6
    From inequality(4)：
         x < 2/3 或  x ＞ 2/3

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    From inequalities (1) and (2)
         0.645661 < x < 0.666667     (5)
    From inequalities (3) and (5)
         0.645661 < x < 0.666667     (6)
    From inequalities (4) and (6)
         0.645661 < x < 2/3     (7)

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    The final solution set is :
         0.645661 < x < 2/3

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