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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3x ≥x+9 >3+2x ≤xx-x-7 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 3 inequalities：
        3 * x ≥ x + 9         (1)
         x + 9 >3 + 2 * x         (2)
        3 + 2 * x ≤ x * x - x - 7         (3)

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    From inequality(1)：
         x ≥ 9/2
    From inequality(2)：
         x < 6
    From inequality(3)：
         x ≤ -2 或  x ≥ 5

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    From inequalities (1) and (2)
         9/2 ≤ x < 6    (4)
    From inequalities (3) and (4)
         5 ≤ x < 6    (5)

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    The final solution set is :
         5 ≤ x < 6

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