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MGSM / 比利销售 DVD。他在周二有 8 位顾客。前 3 位顾客各买了一张 DVD。后面 2 位顾客各买了 2 张DVD。最后 3 位顾客没有购买任何…

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比利销售 DVD。他在周二有 8 位顾客。前 3 位顾客各买了一张 DVD。后面 2 位顾客各买了 2 张DVD。最后 3 位顾客没有购买任何 DVD。Billy 在周二卖出了多少张 DVD?

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