问题
填空题
若函数的图象经过点（2，1），则函数的表达式可能是______（写出一个即可）．
答案
因为函数的图象过点（2，1），
所以可设y=
（k≠0），k x
所以k=2×1=2，即k=2，
所以y=
．2 x
故答案为：如：y=
等．2 x
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若函数的图象经过点（2，1），则函数的表达式可能是______（写出一个即可）．
因为函数的图象过点（2，1），
所以可设y=
（k≠0），k x
所以k=2×1=2，即k=2，
所以y=
．2 x
故答案为：如：y=
等．2 x
补全对话。从方框中选择最佳选项完成对话,有两项多余。
Betty: Hi, Sally. Come in and sit down. Sally: Look at all those fans! __1__ You've got a wonderful collection. Betty: Yes, I've got fifty or sixty fans. __2__ Sally: Yes, I have a collection of dolls. And my brother collects stamps. Betty: And I collect tickets-you know, bus tickets and train tickets! Sally: Really?__3__ I play the violin and I listen to music all the time. Betty: __4__ Sally: My father is a musician. I often listened to him when he played the violin. And he gave me my first violin eight years ago. Betty: And now music has brought you to China. __5__ Sally: At the end of this term. There' s a concert at Radio Beijing. Betty: Wow! You're going to be really famous! I'll go and listen to it! Sally: Thank you ! Betty: You're welcome ! |