题干

某社区活动中心为鼓励居民加强体育锻炼,准备购买10副某种品牌的羽毛球拍,每副球拍配x(x≥2)个羽毛球,供社区居民免费借用.该社区附近A、B两家超市都有这种品牌的羽毛球拍和羽毛球出售,且每副球拍的标价均为30元,每个羽毛球的标价为3元,目前两家超市同时在做促销活动:

A超市:所有商品均打九折(按标价的90%)销售;

B超市:买一副羽毛球拍送2个羽毛球.

设在A超市购买羽毛球拍和羽毛球的费用为yA(元),在B超市购买羽毛球拍和羽毛球的费用为yB(元).请解答下列问题:

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同类题3

(A)信息归纳:阅读下面的短文,根据短文的内容完成信息卡。

    Starting high school can be difficult.Everyone is nervous and nobody knows where to go for classes.Thinking about making new friends might make you feel nervous, too. But don't worry, because you are not alone. You are going to school with a group of students of your age, and we have several tips(贴士) for you to follow.

    Forget your fear and just talk to someone.

    It is easier said than done. But try to take a deep breath and find your voice. Don't be afraid to approach(接近) people. First, you should introduce yourself before starting a conversation about something you have in common. Then, sit in the middle of the classroom with as many new friends around you as possible.

    Join clubs.

    Clubs are good places to make friends. Try to make friends in the club that interest you..If you don't join anything, you will be just going to class and then going home.Being in a club makes you more social.

    Stay clean.

    No one likes a bad smell that could knock someone over.Shower every day, brush your teeth and wash your hair. You are supposed to make yourself look clean and tidy, whatever you wear.

    Be respectful(尊重的) of people's differences.

    Everyone has his or her own opinion of the world.And everyone believes in different things.It's a good thing to have different friends with different opinions because you can each share your own.

Information Card

The number of tips that the writer gives

____.

The thing that might make you feel nervous.

____.

The first thing you should do before starting a conversation about something you have in common.

____.

The good places to make friends

____.

The reason why it's a good thing to have different friends with different opinions

____.