2017-2018英语周报高二课标第34期答案解析

2017-2018英语周报高二课标第34期答案解析已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本网站。

一部分参考范文:(寒假作业1Dear Mr. And Mrs. SmithI'm writing on behalf of our community to invite you to join us in garden activity for theLantem Festival on january 15 of the Chinese lunar yearThe lantern Festival is a traditional Chinese festival to celebrate the first full moon night in anew year. Thus activity is going to be held in the Tianxin Park from 6: oopm to 10: 00 pm, duringwhich time we will admire the beautiful lanterns, guess lantern riddles and enjoy variousinteresting performancesIt will be a great pleasure if you come and have fun with us. I'm sure we will havewonderful time together. Looking forward to your early replyYours Luhua

23.(10分)选修4-5:不等式选讲(1)证明:∵a>0,b>0,a+b=2,x+1+√b+1)2=(a+b)+2+2a+1√b2分2+2+2√a+1√b≤4+2xa+1)+(b+14+(a+b)+2=8.…4分∴a++√b+1≤225分(2)解:a>0,b>0,a+b=2,b=(√ab)2≤(+又∵当a=b=1时,ab=1.∴ab的最大值为1.∴不等式2x+1-|2x-32a对满足已知条件的所有a、b都成立|2x+1-1|2x-3|21成立…6分当xs-时,不等式化为-2x-1-(3-2x)21,化简得-4≥1,不成立,所以不等式无解;当- 时,不等式化为2x+1-(2x-3)21,化简得4≥1,恒成立x232|2x+1-12x-3|21的解集为氏,+叫)综上,实数x的取值范围是[,+∞).…………………10分请注意:以上参考答案与评分标准仅供阅卷时参考,其他答案请参考评分标准酌情给分

以上就是2017-2018英语周报高二课标第34期答案解析，更多英语周报答案请关注本网站。