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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2 <0.118r+167.7/r-5390.35/(r^3) <20 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        2 <0.118 * r + 167.7 / r - 5390.35 / ( r ^ 3 )         (1)
        0.118 * r + 167.7 / r - 5390.35 / ( r ^ 3 ) <20         (2)
        From the definition field of divisor
        x ≠ 0        (3 )
        From the definition field of divisor
         x ^ 3 ≠ 0        (4 )

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    From inequality(1)：
         -5.44105 < r < 0.0001 或  r ＞ 5.803056
    From inequality(2)：
         r < -4.54432 或  0.0001 < r < 160.656419
    From inequality(3)：
         r < 0 或  r ＞ 0
    From inequality(4)：
         r < 0 或  r ＞ 0

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    From inequalities (1) and (2)
         -5.44105 < r < -4.54432 或  5.803056 < r < 160.656419     (5)
    From inequalities (3) and (5)
         -5.44105 < r < -4.54432 或  5.803056 < r < 160.656419     (6)
    From inequalities (4) and (6)
         -5.44105 < r < -4.54432 或  5.803056 < r < 160.656419     (7)

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    The final solution set is :
         -5.44105 < r < -4.54432 或  5.803056 < r < 160.656419

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