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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -3*x^4+10*x^3+20*x^2-40*x+31 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -3 * x ^ 4 + 10 * x ^ 3 + 20 * x ^ 2 - 40 * x + 31 <0         (1)

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    From inequality(1)：
         x < -2.421486 或  x ＞ 4.293349

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    The final solution set is :
         x < -2.421486 或  x ＞ 4.293349

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