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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (42+x)/(42*0.69+x) >0.9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 42 + x ) / ( 42 * 0.69 + x ) >0.9         (1)
        From the definition field of divisor
         42 * 0.69 + x ≠ 0        (2 )

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    From inequality(1)：
         x < -7959/50 或  x ＞ -28.98
    From inequality(2)：
         x < -1449/50 或  x ＞ -1449/50

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    From inequalities (1) and (2)
         x < -7959/50 或  x ＞ -28.98    (3)

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    The final solution set is :
         x < -7959/50 或  x ＞ -28.98

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