2022 英语周报 高考 新课程 19答案

17.解:(1)由正弦定理及(2a+c)cosB= bcos c+c,1E(2sin A+sin C)cos B=sin Bcos C+sin CBp 2sin A cos B +2sin Ccos B=sin Bcos C t sin Ccos B+sin C整理得(2cosB-1)(sinA+sinC)=0(3分)因为在三角形中,sinA>0,sinC>0所以20sB-1=0.即csB=1又因为0

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

以上就是2022 英语周报 高考 新课程 19答案，更多英语周报答案请关注本网站。