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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.2 ≤0.2x-4 <0.4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        0.2 ≤0.2 * x - 4         (1)
        0.2 * x - 4 <0.4         (2)

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    From inequality(1)：
         x ≥ 21
    From inequality(2)：
         x < 22

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    From inequalities (1) and (2)
         21 ≤ x < 22    (3)

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    The final solution set is :
         21 ≤ x < 22

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