2022 英语周报 高二 课标 34答案

第二节书面表aiting for you to explore. Besides, the exceptional PekingDear JackOpera performances there are also whatam so pleased to learn that you are to spertimerecommend you stay in Beijing, the capital and cul-cerelytural center of China. The city enjoys a high reputation forits abundance of ancient architecture, which represents thetraditional local lifestyles. And there

16.参考答案(0,c说明分析不等式(x 1)-e"-aln(x 1)≥0对任意的x∈(0, ∞)恒成立,令t=x 1,则D1,所以不等式等价于re-ant≥0对p1恒成立,变形可得不等式e≥rlnP对p>1恒成立令f(t)=te,p1,则不等式等价于f(1)≥f(lnr)对p1恒成立因为f"(t)=(1 1)e,所以当p1时,f'(t)>0,所以f(t)单调递增,所以不等式转化为t≥h对p1恒成立,即a≤对p>1恒成立令g(1)=L,则g(t)“m少令g(1)=0,解得t=e,当1 0,则g(t)单调递增所以当t=e时,g(1)取得最小值g(e)=e,所以a≤e又a>0,所以实数a的取值范围为(0,ce].故答案为(0,e]

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