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吉林广播电视塔“五一”假期第一天接待游客m人,第二天接待游客n人,则这2天平均每...
吉林广播电视塔“五一”假期第一天接待游客m人,第二天接待游客n人,则这2天平均每天接待游客 人(用含m、n的代数式表示).
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x上一点,则点B与其对应点B′间的距离为( )
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B.3
C.4
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