2022英语周报 高三北师大 答案

一缺乏话句间的连接成分,内容不连贯。信息未能传达给读者。0分未能传达给读者任何信息:内容太少,无法评判:写的内容均与所要求内容无关或所写内容无法看清。(yy) One Possible VersionDear PeterLearning that you want to know the National College Entrance Examination(NCEE)in ourprovince, I'm writing to tell you about it.NCEE is the biggest examination in China, which means a great deal to every Chinesestudent. On one hand, it is the only way to attend a college. On the other hand, it determineswhat job one can obtain in the future. Generally speaking, it usually takes place on 7-8 Juneevery year. Chinese, maths and foreign languages are the required exam subjects. The studentsof arts and science can choose other three subjects according to their willFor me, Peking University is my favorite university, which is the ideal university for mostChinese students

29.6【解析】因为(a-b)·(a+b-2c)=0,所以(a-b)(ba+2a-2c)=0,所以-(a-b)2+2(a-b)(ac)=0所以(a-b)2=2(a-b)(a-c)≤2|a-b|ac|,所以|a-b|2≤6a-b|,所以0≤|a-b≤6,所以a-b|的最大值是6.当且仅当a-b与a-c同向共线时取等号

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