英语周报2022-2023第24期答案

英语周报2022-2023第24期答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本站。

第一节Dear Mr GeorgeI am Li Hua, a volunteer of the activity"Englishi Communication to the Mountains". Now, I'm writing toexpress my sincere apology to you for not being present atthe activity to be held next Monday.The reason for my absence is that I suddenly fell illMy parents sent me to hospital, and I have to stay therefor a week. As for my volunteer work, I have asked myclassmate Tom to do it.Sincerely hoping that you can accept my apologiesYours.Li Hua

21.解:(1)因为(2b-c)cosA= acos o所以2 bcos A= acos O+ CCOs A所以2 sin Bcos A= sin Acos+ sin Ccos A所以2 sin Bcos A=sin(A+C)又因为A+B+C=r所以2 sin bcos a=sinB.又B∈(0号)所以cosA=1.…又因为A∈(0)所以A=5分又因为a=2√3所以△ABC外接圆半径=smA-×23=26分(2)据题设知,如nB=xmnc=mn所以b=4sinB,c=4sinC.7分又A+B+C=,A=所以a+b+c=2+4imB+4im(2-B)…23+6sinB+2√3cos25+43m(B+吾)9分因为△ABC是锐角三角形,且A=B<,解得

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