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

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

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    From inequality(1)：
         y < -2 或  y ＞ 1
    From inequality(2)：
         y < 1
    From inequality(3)：
         y < 1 或  y ＞ 1

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    From inequalities (1) and (2)
         y < -2    (4)
    From inequalities (3) and (4)
         y < -2    (5)

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    The final solution set is :
         y < -2

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