题干

刘老师装饰厨房需用 480 块某品牌的同一种规格的瓷砖,我市盛世商贸城装饰材料商场出售的这种瓷砖有大、小两种包装,大包装每包50片,价格为30元;小包装每包30片,价格为20元,若大、小包装均不拆开零售,请你帮助刘老师制定一种购买方案,使购买瓷砖所付费用最少.

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答案(点此获取答案解析)

解:设购买大包装x包,小包装y包,

根据题意,得50x+30y=480.

因为x、y为非负整数,所以方程的解为x=0y=16

同类题3

阅读理解

    Anki has introduced Cozmo, a little robot powered by an advanced artificial intelligence. Cozmo promises to be for more interactive(互动的)than any toy robot.

    Cozmo, which can lie in your hand, has a “brain”---technically its CPU---that can process data amazingly fast. In addition, Cozmo has a playful personality. He's designed to react to emotions and even ask users to play with him.

    Cozmo is not the first interactive toy to reach the market nor is it the first robot toy. What sets Cozmo apart from the other “smart toys” is that it has greater play value than those toys, which can become repetitious all too quickly.

    “Every interaction with Cozmo is different, so you do not put up with repetitive play patterns and responses typically found with other preprogrammed robots,” explained Anki spokesperson Peter Nguyen. Because it has functionality that is similar to that of video games, Cozmo also can receive regular updates, which could extend its playability. Still, Anki has designed this toy to be just that: a toy. It's not an advanced computerized robot. Its software is app-based.

    Cozmo lacks the “traditional” human-like robot form factor(要素)of legs, arms, and a head. But Cozmo does have an OLED screen/face with blue eyes, which in fact were designed to help it connect with its user.

    “I'm glad my kids are already raised,” said Roger L. Kay, analyst at Endpoint Technologies Associates. “Otherwise, they might become more antisocial if their relationship with Cozmo is more satisfying than those with real people,” said Kay. “Cozmo might encourage kids to learn more about technology or even inspire them to try programming and similar studies,” said Charles King, analyst at Pund-IT.

    Yet this technology does promise to be more than a toy. “It's a pretty cool invention and might have further applications, for example in elder care,” suggested Kay.