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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -x^2+40x-300 ≤0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -x ^ 2 + 40 * x - 300 ≤0         (1)

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    From inequality(1)：
         x ≤ 10 或  x ≥ 30

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    The final solution set is :
         x ≤ 10 或  x ≥ 30

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