2021-2022 英语周报 高考 外研 （XN）10答案

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

8.(1)证明:当n=1时,a1=S1=2a1-2,解得a1=2.…1分当n≥2时3分整理得an2=2an-1-1,即an-1=2(an-1-1)………5分又a1-1=1,所以{an-1}是以1为首项,2为公比的等比数列6分(2)解:由(1)可知an-1=2n1,所以bnog2 (an分T=+a+则2=2+2+2+…+2,…9分两式相减得=1+1+1+…+1-n=2-n+2分故Tn12分

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