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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 7500/(a+74.88)+10000/(a+62.4)+30000/(a+10.4) >143 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        7500 / ( a + 74.88 ) + 10000 / ( a + 62.4 ) + 30000 / ( a + 10.4 ) >143         (1)
        From the definition field of divisor
         x + 74.88 ≠ 0        (2 )
        From the definition field of divisor
         x + 62.4 ≠ 0        (3 )
        From the definition field of divisor
         x + 10.4 ≠ 0        (4 )

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    From inequality(1)：
         -74.88 < a < -70.786532 或  -62.4 < a < -47.585126 或  a ＞ -10.4
    From inequality(2)：
         a < -1872/25 或  a ＞ -1872/25
    From inequality(3)：
         a < -312/5 或  a ＞ -312/5
    From inequality(4)：
         a < -52/5 或  a ＞ -52/5

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    From inequalities (1) and (2)
         -74.88 < a < -70.786532 或  -62.4 < a < -47.585126 或  a ＞ -10.4    (5)
    From inequalities (3) and (5)
         -74.88 < a < -70.786532 或  -312/5 < a < -47.585126 或  a ＞ -10.4    (6)
    From inequalities (4) and (6)
         -74.88 < a < -70.786532 或  -312/5 < a < -47.585126 或  a ＞ -52/5    (7)

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    The final solution set is :
         -74.88 < a < -70.786532 或  -312/5 < a < -47.585126 或  a ＞ -52/5

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