题干

 全班42个学生,够每人一个吗?

  ____  ____  ____ = ____

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40,+,9,49,够

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    China's Singles Day, which falls on Nov. 11 every year, has far surpassed its U. S. counterparts of Black Friday and Cyber Monday—combined Last year, Americans spent a record $ 12.8 billion online between Thanksgiving Day and Cyber Monday. It's impressive until you compare it to the $ 17.6 billion in sales made by Chinese consumers in a single 24-hour period during 2016's Singles Day.

    Singles Day is known as “Bare Sticks Day” or “Bare Branches Day” in Chinese-because the date “11/11” looks like bare branches and “one” is the loneliest number. Singles Day began in the early 1990s in the dorm rooms of Nanjing University when a group of single friends were sorry about the lack of significant others and decided to mark the day by organizing activities as a group of singles and reducing their loneliness by buying themselves a gift.

    Then in 2009, sensing a break between the sales period of China's National Day on Oct. 1 and Chinese New Year in late January or early February, Alibaba's Jack Ma saw an opening: sell to comfort lonely hearts.

    The first year did only $7.5 million in sales, but just 8 years later, shoppers spent $ 25.3 billion, or 168.2 billion yuan, this year—a 40 percent jump from last year's $ 17.6 billion. For comparison, Black Friday and Cyber Monday in the U. S. only netted $ 6.79 billion in 2016. Amazon doesn't release sales figures for July's Prime Day, but it's pretty safe to believe the not-quite-national-holiday doesn't come close to $ 25 billion.

    “More than $ 25 billion in one day is not just a sales figure,” Alibaba Group CEO Daniel Zhang said in a statement. “It represents the desire for quality consumption of the Chinese consumer, and it reflects how merchants and consumers alike have now fully accepted the combination of online and offline sales.”