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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 30x+50(6-x)+(10-x)40+80(2+x) <900 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        30 * x + 50 * ( 6 - x ) + ( 10 - x ) * 40 + 80 * ( 2 + x ) <900         (1)

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    From inequality(1)：
         x < 2

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    The final solution set is :
         x < 2

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