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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1+((21-9x)/(x*(x+9))) ≤-10/(x+9) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 + ( ( 21 - 9 * x ) / ( x * ( x + 9 ) ) ) ≤ -10 / ( x + 9 )         (1)
        From the definition field of divisor
         x * ( x + 9 ) ≠ 0        (2 )
        From the definition field of divisor
         x + 9 ≠ 0        (3 )

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    From inequality(1)：
         -9 ≤ x ≤ -7 或  -3 ≤ x ≤ 0
    From inequality(2)：
         x < -9 或  -9 < x < 0 或  x ＞ 0
    From inequality(3)：
         x < -9 或  x ＞ -9

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    From inequalities (1) and (2)
         -9 < x ≤ -7 或  -3 ≤ x < 0    (4)
    From inequalities (3) and (4)
         -9 < x ≤ -7 或  -3 ≤ x < 0    (5)

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    The final solution set is :
         -9 < x ≤ -7 或  -3 ≤ x < 0

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