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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -x^2-2 <= 3x <= x^2+2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -x ^ 2 - 2 <= 3 * x         (1)
         3 * x <= x ^ 2 + 2         (2)

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    From inequality(1)：
         x ≤ -2 或  x ≥ -1
    From inequality(2)：
         x ≤ 1 或  x ≥ 2

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    From inequalities (1) and (2)
         x ≤ -2 或  -1 ≤ x ≤ 1 或  x ≥ 2    (3)

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    The final solution set is :
         x ≤ -2 或  -1 ≤ x ≤ 1 或  x ≥ 2

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