英语周报 2018-2022 高三 HNN 3答案

第三节书面表达wersionDear Sir or MadamMy name is Li Hua. As an exchange student fromChina, I am studying in a local school. I am reallydelighted to learn that a volunteer for your Chinese culturallic exhibition is required and I'm confident that I amtruly fit for thestart with, my advantage first lies in the fact that IChina and used to beand quite familiar with Chinese relics. Further-more, being an outgoing and optimistic boy, I am good atcommunicating with others and introducing Chinese cultureto the world is always my honor and my pleasure. Finallythere is no problem with my spoken English, as I havelived here for almost a year and I have no difficulty commu-dicating with others in EnglishI would really appreciate it if you can offer me thechance to be a volunteer in your museum. I am looking forward to your early reply.Li Hua

22.解:(1)由题得,函数f(x)的定义域为(0,+∞),f(x)=2-又函数f(x)=lnx+(a∈R)的图象在x=1的切线与直线x-2y+1=0平行,f(1)=1-2=,解得a=2,fn)=kx+…f(2=12-2x2令f(x)<0,解得0 0,解得x>,故函数(x)的单调递减区间为(o,2),单调递增区间为(,+∞(6分)(2)由x1,x2为函数f(x)=m的两个零点,得lnx1+两式相减,可得lnx1-lnx2+1-1即1n丑=2二2,x1x2=22In五-11-五因此x1212In令t=,由x1 1故x1+x2>1得证(12分)

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