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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -x+4 ≤-2x+3 ≤x+9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -x + 4 ≤ -2 * x + 3         (1)
         -2 * x + 3 ≤ x + 9         (2)

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    From inequality(1)：
         x ≤ -1
    From inequality(2)：
         x ≥ -2

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    From inequalities (1) and (2)
         -2 ≤ x ≤ -1    (3)

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    The final solution set is :
         -2 ≤ x ≤ -1

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