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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 20x^12-21x^11-120x^7+221x^6-99x^5-1 ≤0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * x ^ 12 - 21 * x ^ 11 - 120 * x ^ 7 + 221 * x ^ 6 - 99 * x ^ 5 - 1 ≤0         (1)

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    From inequality(1)：
         -0.349768 ≤ x ≤ 1 或  1 ≤ x ≤ 1 或  1 ≤ x ≤ 1.086836

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    The final solution set is :
         -0.349768 ≤ x ≤ 1 或  1 ≤ x ≤ 1 或  1 ≤ x ≤ 1.086836

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