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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (100-1000)/(1+x)+(450-1000)/(1+x)^2+(1050-1000)/(1+x)^3+(1900-1000)/(1+x)^4 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 100 - 1000 ) / ( 1 + x ) + ( 450 - 1000 ) / ( 1 + x ) ^ 2 + ( 1050 - 1000 ) / ( 1 + x ) ^ 3 + ( 1900 - 1000 ) / ( 1 + x ) ^ 4 >0         (1)
        From the definition field of divisor
         1 + x ≠ 0        (2 )
        From the definition field of divisor
         1 + x ≠ 0        (3 )
        From the definition field of divisor
         1 + x ≠ 0        (4 )
        From the definition field of divisor
         1 + x ≠ 0        (5 )

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    From inequality(1)：
         x < -0.152683
    From inequality(2)：
         x < -1 或  x ＞ -1
    From inequality(3)：
         x < -1 或  x ＞ -1
    From inequality(4)：
         x < -1 或  x ＞ -1
    From inequality(5)：
         x < -1 或  x ＞ -1

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    From inequalities (1) and (2)
         x < -1 或  -1 < x < -0.152683     (6)
    From inequalities (3) and (6)
         x < -1 或  -1 < x < -0.152683     (7)
    From inequalities (4) and (7)
         x < -1 或  -1 < x < -0.152683     (8)
    From inequalities (5) and (8)
         x < -1 或  -1 < x < -0.152683     (9)

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    The final solution set is :
         x < -1 或  -1 < x < -0.152683

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