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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 21×a/(19200+4×a)     Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        21 × a / ( 19200 + 4 × a ) < a / 300         (1)
        From the definition field of divisor
         19200 + 4 × x ≠ 0        (2 )

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    From inequality(1)：
         a ＞ 0
    From inequality(2)：
         a < -4800 或  a ＞ -4800

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    From inequalities (1) and (2)
         a ＞ 0    (3)

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    The final solution set is :
         a ＞ 0

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