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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2 ≤4.5*(x/(x+5)) ≤3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        2 ≤4.5 * ( x / ( x + 5 ) )         (1)
        4.5 * ( x / ( x + 5 ) ) ≤3         (2)
        From the definition field of divisor
         x + 5 ≠ 0        (3 )

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    From inequality(1)：
         x ≤ -5 或  x ≥ 4
    From inequality(2)：
         -5 ≤ x ≤ 10
    From inequality(3)：
         x < -5 或  x ＞ -5

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    From inequalities (1) and (2)
         -5 ≤ x ≤ -5 或  4 ≤ x ≤ 10    (4)
    From inequalities (3) and (4)
         4 ≤ x ≤ 10    (5)

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    The final solution set is :
         4 ≤ x ≤ 10

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