2021-2022英语周报高一课标29期答案

21.解:(1)当a=0时,f(x)= rsin+cosx(x∈[-r,x1),所以f(-x)=f(x),即f(x)为偶函数分讨论:当x∈[0,m]时,f(x)= asin+cosx,所以f(x)=sinx+ cos r-sinx= rcos T所以当x∈[0,号时,(x)≥0当x∈[是,]时,(x)≤0,m所以函数f(x)在[,号]上单调递增,在[号“上单调递减分分分又根据偶函数图象关于y轴对称知,函数f()在[一,一号]上单调递增,在[一号,小上单调递减分(2)因为f(x)= Esin a+cosx+bax2,所以了(x)= rcos r+ax=x(cosx+a)6分讨论:当a≥1时,广(x)≥0对任意的x∈[0,x]恒成立,此时f(x)在[0,m]上单调递增又f(0)=1,所以关于x的方程f(x)=0无实数根7分当0 0;当x∈(x,x)时,f(x)<0,所以函数f(x)在(0,x)上单调递增,在(x,x)上单调递减(0)=1,f()=1.当1ax2-1>0,即3 与时,关于x的方程f(x)=0无实数根

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

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