Overview: 4 questions will be solved this time.Among them
           ☆4 inequalities

[ 1/4Inequality]
    Assignment:Find the solution set of inequality 30 >2f .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        30 >2 * f         (1)

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    From inequality(1)：
         f < 15

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    The final solution set is :
         f < 15
[ 2/4Inequality]
    Assignment:Find the solution set of inequality f <15 <2f .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
         f <15         (1)
        15 <2 * f         (2)

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    From inequality(1)：
         f < 15
    From inequality(2)：
         f ＞ 15/2

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    From inequalities (1) and (2)
         15/2 < f < 15     (3)

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    The final solution set is :
         15/2 < f < 15
[ 3/4Inequality]
    Assignment:Find the solution set of inequality f <7 <2f .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
         f <7         (1)
        7 <2 * f         (2)

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    From inequality(1)：
         f < 7
    From inequality(2)：
         f ＞ 7/2

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    From inequalities (1) and (2)
         7/2 < f < 7     (3)

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    The final solution set is :
         7/2 < f < 7
[ 4/4Inequality]
    Assignment:Find the solution set of inequality 23 >2f .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        23 >2 * f         (1)

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    From inequality(1)：
         f < 23/2

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    The final solution set is :
         f < 23/2

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