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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -1 ≤x－x² ≤1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -1 ≤ x - x ^ 2         (1)
         x - x ^ 2 ≤1         (2)

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    From inequality(1)：
         -0.618034 ≤ x ≤ 1.618034
    From inequality(2)：
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!

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    From inequalities (1) and (2)
         -0.618034 ≤ x ≤ 1.618034    (3)

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    The final solution set is :
         -0.618034 ≤ x ≤ 1.618034

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