2022-2203陕西省高一年级选科调考(二)(002A SX)生物答案

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4.在数列{a.}中，2am-1a+1=a-1a.十a,am+1(n≥2)，a1=1,a:=3,则a0=A易Bc1D.43【答案】B【解析】由2a.-1a1=a.1a.十aa+1(m≥2)，得2=1+1(n≥2)，可得，1-1-=1-1（n≥2).设an an+1 an-1an+1 anan an-11=b.,则b+1-b.=b,-b-1=d,可得数列{6，为等差数列，其公差为d,由a1=1,a2=3,可得b1=1,b=13,d=b:-b,=3-1=2,所以6.=1+2n-1)=2nr1,故a.=2n-1,所以a0=3

Dear Tom,Knowing that you are extremely keen on Chinese culture,I'm more than delighted to write to you with theintention of inviting you to join the Confucianism online club established by our school recently.The club possesses various characteristics.First of all,we hold regular sessions,studying the statements ofConfucius,who has a profound influence on Chinese philosophy.What's more,professors related are frequentlyinvited to give speeches on Confucianism online,thus providing club members with lots of traditional knowledge.As far as I'm concerned,the club is of great significance and can help you to gain a better understanding ofChinese culture.I'd appreciate it if you could take my invitation into consideration seriously.I have the confidence that youwill make great progress in learning Chinese culture.Looking forward to your reply.YoursLi Hua