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           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2.5 <-4.256x^3+181.748x^2-2663.508x+15354.783 <3584.345 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        2.5 < -4.256 * x ^ 3 + 181.748 * x ^ 2 - 2663.508 * x + 15354.783         (1)
         -4.256 * x ^ 3 + 181.748 * x ^ 2 - 2663.508 * x + 15354.783 <3584.345         (2)

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    From inequality(1)：
         x < 21.227241
    From inequality(2)：
         x ＞ 7.854834

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    From inequalities (1) and (2)
         7.854834 < x < 21.227241     (3)

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    The final solution set is :
         7.854834 < x < 21.227241

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