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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.25*0.75^x/(1-0.75^(x+1)) <= 10^(-6) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.25 * 0.75 ^ x / ( 1 - 0.75 ^ ( x + 1 ) ) <= 10 ^ ( -6 )         (1)
        From the definition field of divisor
         1 - 0.75 ^ ( x + 1 ) ≠ 0        (2 )

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    From inequality(1)：
         x ≤ -1 或  x ≥ 8640941/200000
    From inequality(2)：
         x < -1 或  x ＞ -1

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    From inequalities (1) and (2)
         x < -1 或  x ≥ 8640941/200000    (3)

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    The final solution set is :
         x < -1 或  x ≥ 8640941/200000

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