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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （x^2-1）(x^2-6x+8) ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( x ^ 2 - 1 ) * ( x ^ 2 - 6 * x + 8 ) ≥0         (1)

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    From inequality(1)：
         x ≤ -1 或  1 ≤ x ≤ 2 或  x ≥ 4

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    The final solution set is :
         x ≤ -1 或  1 ≤ x ≤ 2 或  x ≥ 4

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