英语周报2020——2021初二第14期答案

书面表达One possible version:Dear Mr. Smith.First of all, I would like to congratulate you on your school s sixtieth anniversary. The long history of theschool brings up its outstanding campus culture and educational concept. I take great pride in studying at thisexcellent school, At your invitation, I will perform a Chinese folk dance at the celebration ceremony to expressmy congratulations. Please prepare the audio equipment to play the accompanying music. I will prepare thedance music and costumes myself. I am delighted to be able to make a modest contribution to the promotion ofChinese culture and cultural exchanges between China and the UKBest wishes.Yours truly,Li Hu

(16)解:(1)由(2sinA-√3inB)2=4sinC-sin2B化简,得sin2A+sin2B-sinC=√ sinasin B,2分由正弦定理,得a2+b2-c2=√3b所以由余弦定理,得cosC=…4分2ab又C∈(0,n),所以C=…6分6(Ⅱ)因为b=1,c=√7,所以由正弦定理,得sinB………8分B sin C因为b

以上就是英语周报2020——2021初二第14期答案，更多英语周报答案请关注本网站。