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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （18000/21X+1120)^2+(3000/3500+7X)^2 <100^2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 18000 / 21 * X + 1120 ) ^ 2 + ( 3000 / 3500 + 7 * X ) ^ 2 <100 ^ 2         (1)

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    From inequality(1)：
         -1.422849 < X < -1.190326

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    The final solution set is :
         -1.422849 < X < -1.190326

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