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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1/（x+4）+1/（x+5） >1/（x+6）+1/（x+3） .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 / ( x + 4 ) + 1 / ( x + 5 ) >1 / ( x + 6 ) + 1 / ( x + 3 )         (1)
        From the definition field of divisor
         x + 4 ≠ 0        (2 )
        From the definition field of divisor
         x + 5 ≠ 0        (3 )
        From the definition field of divisor
         x + 6 ≠ 0        (4 )
        From the definition field of divisor
         x + 3 ≠ 0        (5 )

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    From inequality(1)：
         x < -6 或  -5 < x < -9/2 或  -4 < x < -3
    From inequality(2)：
         x < -4 或  x ＞ -4
    From inequality(3)：
         x < -5 或  x ＞ -5
    From inequality(4)：
         x < -6 或  x ＞ -6
    From inequality(5)：
         x < -3 或  x ＞ -3

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    From inequalities (1) and (2)
         x < -6 或  -5 < x < -9/2 或  -4 < x < -3     (6)
    From inequalities (3) and (6)
         x < -6 或  -5 < x < -9/2 或  -4 < x < -3     (7)
    From inequalities (4) and (7)
         x < -6 或  -5 < x < -9/2 或  -4 < x < -3     (8)
    From inequalities (5) and (8)
         x < -6 或  -5 < x < -9/2 或  -4 < x < -3     (9)

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    The final solution set is :
         x < -6 或  -5 < x < -9/2 或  -4 < x < -3

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