Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 2π*3π/4 >7π/10 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * π * 3 * π / 4 >7 * π / 10         (1)

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    From inequality(1)：
          ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!

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    The final solution set is :
          ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 2π/w*5π/4 <17π/10 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * π / w * 5 * π / 4 <17 * π / 10         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         w < 0 或  w ＞ 4.619989
    From inequality(2)：
         w < 0 或  w ＞ 0

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    From inequalities (1) and (2)
         w < 0 或  w ＞ 4.619989    (3)

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    The final solution set is :
         w < 0 或  w ＞ 4.619989

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