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

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

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

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    From inequalities (1) and (2)
         F < -3 或  F ＞ 1    (3)

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    The final solution set is :
         F < -3 或  F ＞ 1

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