Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 790^2-X^2 >= 750^2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        790 ^ 2 - X ^ 2 >= 750 ^ 2         (1)

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    From inequality(1)：
         -248.193473 ≤ X ≤ √61600

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    The final solution set is :
         -248.193473 ≤ X ≤ √61600
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 755^2-x^2 <= 750^2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        755 ^ 2 - x ^ 2 <= 750 ^ 2         (1)

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    From inequality(1)：
         x ≤ -√7525 或  x ≥ √7525

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    The final solution set is :
         x ≤ -√7525 或  x ≥ √7525

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