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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -647.1419+241.894*n+（281.21*n+18.82*n^2)*(843.63*n+37.63*n^2)/(1687.26+112.89*n)-1.2*(100.94*n+4.87*n^2)*(302.82*n+9.74*n^2)/(605.64+29.22*n) ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -647.1419 + 241.894 * n + ( 281.21 * n + 18.82 * n ^ 2 ) * ( 843.63 * n + 37.63 * n ^ 2 ) / ( 1687.26 + 112.89 * n ) - 1.2 * ( 100.94 * n + 4.87 * n ^ 2 ) * ( 302.82 * n + 9.74 * n ^ 2 ) / ( 605.64 + 29.22 * n ) ≥0         (1)
        From the definition field of divisor
         1687.26 + 112.89 * x ≠ 0        (2 )
        From the definition field of divisor
         605.64 + 29.22 * x ≠ 0        (3 )

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    From inequality(1)：
         -13.524859 ≤ n ≤ -6.604019 或  n ≥ 1.669641
    From inequality(2)：
         n < -14.946054 或  n ＞ -14.946054
    From inequality(3)：
         n < -20.726899 或  n ＞ -20.726899

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    From inequalities (1) and (2)
         -13.524859 ≤ n ≤ -6.604019 或  n ≥ 1.669641    (4)
    From inequalities (3) and (4)
         -13.524859 ≤ n ≤ -6.604019 或  n ≥ 1.669641    (5)

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    The final solution set is :
         -13.524859 ≤ n ≤ -6.604019 或  n ≥ 1.669641

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