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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 0.6x+1.1(80-x) <69 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.6 * x + 1.1 * ( 80 - x ) <69         (1)

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    From inequality(1)：
         x ＞ 38

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    The final solution set is :
         x ＞ 38
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 0.9x+0.4(80-x) <52 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.9 * x + 0.4 * ( 80 - x ) <52         (1)

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    From inequality(1)：
         x < 40

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    The final solution set is :
         x < 40

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