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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x^9+2x^8-7x^7+6x^5-5x^6-80x^4-12x^3+2x^2-9x >90x^9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ^ 9 + 2 * x ^ 8 - 7 * x ^ 7 + 6 * x ^ 5 - 5 * x ^ 6 - 80 * x ^ 4 - 12 * x ^ 3 + 2 * x ^ 2 - 9 * x >90 * x ^ 9         (1)

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    From inequality(1)：
         x < -0.909488 或  -0.561546 < x < 0

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    The final solution set is :
         x < -0.909488 或  -0.561546 < x < 0

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