英语周报七手2022-2022答案

【参考范文】To whom it ma concernI am one of your customers. I ordered a set of English short stories on your online store ofAmazon a month ago, but I didn't receive them until yesterday. And much to my disappointmentthe books were so poorly packed up that the package is broken and the cover of one book was tornTo make matters worse, it is not a complete set, for I found one book missingI am sorry to have received such poor service, and I believe I have every right to ask you todeal with this problem. I hope that you either return my money or deliver a new set of books to meBesides, I'd like to be informed of the process of your dealing with my complaintLooking forward to your reply.L

15.2x3(答案不唯一)【解析】因为f(x)为奇函数,所以b=0,所以f(x)=2x3-ax,所以f(x)=6x2-a≥0恒成立,所以只需a≤0,故可取a=0,所以f(x)的解析式可以为f(x)=2x3

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