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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -20x^3+5x^2+7x+20 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -20 * x ^ 3 + 5 * x ^ 2 + 7 * x + 20 >0         (1)

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    From inequality(1)：
         x < 1.2152

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    The final solution set is :
         x < 1.2152

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