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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x∧3+5x∧2+4x >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ^ 3 + 5 * x ^ 2 + 4 * x >0         (1)

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    From inequality(1)：
         -4 < x < -1 或  x ＞ 0

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    The final solution set is :
         -4 < x < -1 或  x ＞ 0

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