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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （-9）*x^4+4*x^3+7*x^2-2x >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( -9 ) * x ^ 4 + 4 * x ^ 3 + 7 * x ^ 2 - 2 * x >0         (1)

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    From inequality(1)：
         -0.824937 < x < 0 或  0.269381 < x < 1

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    The final solution set is :
         -0.824937 < x < 0 或  0.269381 < x < 1

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