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           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (0.639+0.141e(-2.3166x))/(0.639+0.141e(-2.106x)) >0.99 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 0.639 + 0.141 * e ( -2.3166 * x ) ) / ( 0.639 + 0.141 * e ( -2.106 * x ) ) >0.99         (1)
        From the definition field of divisor
         0.639 + 0.141 * e ( -2.106 * x ) ≠ 0        (2 )

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    From inequality(1)：
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
    From inequality(2)：
         x ∈ R （R为全体实数），即在实数范围内，不等式恒成立！

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    From inequalities (1) and (2)
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!    (3)

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    The final solution set is :
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!

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