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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1 ≤abs（1-2x） <3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        1 ≤ abs ( 1 - 2 * x )         (1)
         abs ( 1 - 2 * x ) <3         (2)

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    From inequality(1)：
         x ≤ 0 或  x ≥ 1
    From inequality(2)：
         -1 < x < 2

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    From inequalities (1) and (2)
         -1 < x ≤ 0 或  1 ≤ x < 2    (3)

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    The final solution set is :
         -1 < x ≤ 0 或  1 ≤ x < 2

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