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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1000 <0.7X <2000 <3000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 3 inequalities：
        1000 <0.7 * x         (1)
        0.7 * x <2000         (2)
        2000 <3000         (3)

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    From inequality(1)：
         x ＞ 1428.571429
    From inequality(2)：
         x < 2857.142857
    From inequality(3)：
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!

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    From inequalities (1) and (2)
         1428.571429 < x < 2857.142857     (4)
    From inequalities (3) and (4)
         1428.571429 < x < 2857.142857     (5)

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    The final solution set is :
         1428.571429 < x < 2857.142857

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