英语周报2018＿2022高二答案

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!

17.(本小题满分12分)解:()函数对)一x9)+c3x-1smnx308x+m+o2x-NE Sin xcos? +I sin cos - 3sIn x cos x+-cos"xsin 2x+-cos 2x)+42sn(2x+x)14.3分xE-x,0,所以一丌2x+≤,:-1≤sm(x+)s1,当2xm3时,即当x=-x时,函数f(x)取最大值6分(2)由题意f(4)=sm(24+2)+1=1,化简得sn(24+2)=,∵A∈(0,x)2A+z∈(.13z),∴2A+丌5丌解得A在△ABC中,根据余弦定理,得a2=b2+c2- bc cos-=(b+c)2-3bc由b+c=4,知bcs2)=4,即a24当=c=2时,a取最小值为

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