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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x(x-10)(x+45) >= 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x * ( x - 10 ) * ( x + 45 ) >= 0         (1)

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    From inequality(1)：
         -45 ≤ x ≤ 0 或  x ≥ 10

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    The final solution set is :
         -45 ≤ x ≤ 0 或  x ≥ 10

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