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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.8[0.8x+0.3(400－x)]+0.3*[0.7(400－x)+0.2x] >200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.8 * ( 0.8 * x + 0.3 * ( 400 - x ) ) + 0.3 * ( 0.7 * ( 400 - x ) + 0.2 * x ) >200         (1)

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    From inequality(1)：
         x ＞ 80

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    The final solution set is :
         x ＞ 80

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