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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 6x+7 >89x-x^2 <89+x^2-x^3 >19^2-x^3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 3 inequalities：
        6 * x + 7 >89 * x - x ^ 2         (1)
        89 * x - x ^ 2 <89 + x ^ 2 - x ^ 3         (2)
        89 + x ^ 2 - x ^ 3 >19 ^ 2 - x ^ 3         (3)

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    From inequality(1)：
         x < 0.084423 或  x ＞ 82.915577
    From inequality(2)：
         x < 1.011362
    From inequality(3)：
         x < -√272 或  x ＞ √272

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    From inequalities (1) and (2)
         x < 0.084423    (4)
    From inequalities (3) and (4)
         x < -√272    (5)

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    The final solution set is :
         x < -√272

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