英语周报必修一2022 202215期答案

第二节One possible version:Dear RussellI,m glad to inform you that our school will hold anEnglish humorous story speech contest in the center hallthis Sunday in order to develop our sense of humor andpractice our spoken English. I' d like to invite you to takert in ItEvery participant is requested to prepare a humorousstory in English by themselves. So choose your story cau-tiously. The funnier your story is, the better it is. You areexpected to deliver your speech within five minutes. Youshould tell your story at a proper pace with a clear voiceLooking forward to your participation. I'm sure youwill be one of the winnersYoursLi Hu

19.解:(1)由题意知,函数∫(x)=x2-2ax+a的对称轴为1,即a=1(2分)(2)因为函数f(x)=x2-2ax+a的图象的对称轴为直线x=a又f(x)在[1,+∞)上为单调递增函数,所以a≤1,故实数a的取值范围为(-∞,1](6分)(3》易知函数∫(x)的图象开口向上,对称轴为直线若a<0,当x=1时,函数f(x)取得最大值1-a(8分)若a>0,当x=-1时,函数f(x)取得最大值1+(10分)若a=0,当x=1或-1时,函数f(x)取得最大值1(12分)

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