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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2x/(x-7)(x+4) ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * x / ( x - 7 ) * ( x + 4 ) ≥0         (1)
        From the definition field of divisor
         x - 7 ≠ 0        (2 )

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    From inequality(1)：
         -4 ≤ x ≤ 0 或  x ≥ 7
    From inequality(2)：
         x < 7 或  x ＞ 7

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    From inequalities (1) and (2)
         -4 ≤ x ≤ 0 或  x ＞ 7    (3)

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    The final solution set is :
         -4 ≤ x ≤ 0 或  x ＞ 7

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