英语周报50期高一答案

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!

3.(1)由已知及正弦定理得,2cosC(sinA cosB+sin Bcos)=sinC2coscsin(a+B)=sinc故2 sinc cosc=sinC.可得cosC=,所以CT23(2)由已知,得1 boinC-=33又C=,所以ab=6由已知及余弦定理得,a2+b2-2 abcess=7.故a2+b2=13,从而(a+b)2=25.∴a+b=5所以△ABC的周长为5+√7

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