百师联盟 2023届高三冲刺卷(二)2 湖南卷生物答案

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π18.选①②③1)3：2(1,4)【详解】(①)选①：(a-ca+c)=b(a-b),:.a2-c2=ab-b2..a2+b2-c2=ab.cOsC=atbi-c=ab=12ab2ab2】又，ce0,C=胥.选②：V3 acosC=csinA,由正弦定理得V3 sin AcosC=sinCsin A,Ae(0,),÷sinA≠0，3cosC=sinC,tan C=3又ce0,C=.选0：wr(经+cowc-.(-sin C)+cosC=1-cos2C+cosC=C-oscosC=2又ce0,:C=(2)由正弦定理sin A sin B sinC,a2.sin A sin B2sin A 2sin(B+C)2sinB+3Q=sin Bsin Bsin BsinB+√3cosB=1+3sin Btan BC=元:△ABC为锐角三角形，30<2元3B∠可得0

五、书面表达One possible version:Hello,everyone!Our school will organize an activitycalled "Chinese Culture Festival"for foreign teachers andexchange students,which aims to help them have a betterunderstanding of traditional Chinese culture.In this activity,there will be some games related topoems.I know some foreigners have a great passion fortraditional Chinese poems,so I'm glad to invite you toparticipate in the activity.We have prepared special giftsfor those who win the games.I wish this important event a great success.You arebound to have a wonderful time.