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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (k-1)^4-(k^2+1)×(k-1)×(k-3) ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( k - 1 ) ^ 4 - ( k ^ 2 + 1 ) × ( k - 1 ) × ( k - 3 ) ≥0         (1)

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    From inequality(1)：
         k ≤ -1 或  k ≥ 1

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    The final solution set is :
         k ≤ -1 或  k ≥ 1

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