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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2 ≤2^k-1 ≤1000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        2 ≤2 ^ k - 1         (1)
        2 ^ k - 1 ≤1000         (2)

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    From inequality(1)：
         k ≥ 1.584962
    From inequality(2)：
         k ≤ 9.967226

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    From inequalities (1) and (2)
         1.584962 ≤ k ≤ 9.967226    (3)

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    The final solution set is :
         1.584962 ≤ k ≤ 9.967226

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