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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -37500+5700/(1+r)+12900/(1+r)^2+16300/(1+r)^3+27500/(1+r)^4 <-37500+17300/(1+r)+16200/(1+r)^2+13800/(1+r)^3+7600/(1+r)^4 = 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -37500 + 5700 / ( 1 + r ) + 12900 / ( 1 + r ) ^ 2 + 16300 / ( 1 + r ) ^ 3 + 27500 / ( 1 + r ) ^ 4 < -37500 + 17300 / ( 1 + r ) + 16200 / ( 1 + r ) ^ 2 + 13800 / ( 1 + r ) ^ 3 + 7600 / ( 1 + r ) ^ 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 )
        From the definition field of divisor
         1 + x ≠ 0        (6 )
        From the definition field of divisor
         1 + x ≠ 0        (7 )
        From the definition field of divisor
         1 + x ≠ 0        (8 )
        From the definition field of divisor
         1 + x ≠ 0        (9 )

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    From inequality(1)：
         r ＞ 0.295172
    From inequality(2)：
         r < -1 或  r ＞ -1
    From inequality(3)：
         r < -1 或  r ＞ -1
    From inequality(4)：
         r < -1 或  r ＞ -1
    From inequality(5)：
         r < -1 或  r ＞ -1
    From inequality(6)：
         r < -1 或  r ＞ -1
    From inequality(7)：
         r < -1 或  r ＞ -1
    From inequality(8)：
         r < -1 或  r ＞ -1
    From inequality(9)：
         r < -1 或  r ＞ -1

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    From inequalities (1) and (2)
         r ＞ 0.295172    (10)
    From inequalities (3) and (10)
         r ＞ 0.295172    (11)
    From inequalities (4) and (11)
         r ＞ 0.295172    (12)
    From inequalities (5) and (12)
         r ＞ 0.295172    (13)
    From inequalities (6) and (13)
         r ＞ 0.295172    (14)
    From inequalities (7) and (14)
         r ＞ 0.295172    (15)
    From inequalities (8) and (15)
         r ＞ 0.295172    (16)
    From inequalities (9) and (16)
         r ＞ 0.295172    (17)

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    The final solution set is :
         r ＞ 0.295172

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