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书面表达One posssible[文] versionDe[章]ar Mr. Smith,I'm Li Hua, a senior 3 student. Learning that your City Culture departmen[来]t is looking for an English editorthi[自]s summer, I'm eager to apply for the position.[知]As far as I'm concerned[嘛], city culture refers to a citys history, geography[答], customs, future, and so on. Asa native, I am quite familiar with our citys tradition[案]al culture. Besides, I have a good command of ErI' m especiall[网]y good at English writing. Additiona[文]lly, Im cooperati[章]ve and creative,[来] which will give me anadvanta[自]ge for the position.[知]I'll be greatly honored if I' m chosen for the job. If I'm admitted,[嘛] please email me at lihua @16com.Yo[答]urs sincerely[案],Li Hu
17.(1)证明:[网]因为sinC=2 sin bcos(B+C)[文],所以c=-2 bcos A,…………………[章]……………………2[来]分所以c=2b×y[自]=3b,1分即c2[知]=362,…………[嘛]………6分(2)解[答];因为mA=,即1[案]b=,所以b=3.[网]………………………[文]………………………[章]………8分又由(1[来])知c=√3b,所[自]以/3b2=√3,[知]解得b=1,………[嘛]…………9分所以c[答]=√3,10分由余[案]弦定理知a2=2+[网]c2-2bosA=[文]1+3-2×3×([章]-)=7,所以a=[来]√7.………………[自]………………………[知]……12分评分细则[嘛]:(1)第一问能用[答]正弦定理写出关系式[案]给2分,求出c=③[网]b累计得4分,第一[文]问全部正确解出,累[章]计得6分(2)第二[来]问能用三角形面积公[自]式写出bc=3给2[知]分,能分别求出b,[嘛]c的值,本步骤得2[答]分,最后用余弦定理[案]求出a=√7再得2[网]分(3)其他情况根[文]据评分标准按步骤给[章]分
