Overview: 3 questions will be solved this time.Among them
           ☆3 inequalities

[ 1/3Inequality]
    Assignment:Find the solution set of inequality 800^2-4X^2 >= 750^2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        800 ^ 2 - 4 * X ^ 2 >= 750 ^ 2         (1)

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    From inequality(1)：
         -139.194109 ≤ X ≤ √19375

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    The final solution set is :
         -139.194109 ≤ X ≤ √19375
[ 2/3Inequality]
    Assignment:Find the solution set of inequality 785^2-x^2 >= 750^2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        785 ^ 2 - x ^ 2 >= 750 ^ 2         (1)

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    From inequality(1)：
         -√53725 ≤ x ≤ √53725

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    The final solution set is :
         -√53725 ≤ x ≤ √53725
[ 3/3Inequality]
    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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