衡水金卷先享题2024答案数学分科综合卷 新教材乙卷A
49B回12:47令46图像Word调整21.解:如图,过点A作AF⊥CE于点F,则∠AFE=∠AFD=90°E…1分由题意可知CD=20米,CE=66.4米,∠DAF=∠a=45°,∠EAF=∠B=30°,∠ABC=∠BCD=90°..DE...
49B回12:47令46图像Word调整21.解:如图,过点A作AF⊥CE于点F,则∠AFE=∠AFD=90°E…1分由题意可知CD=20米,CE=66.4米,∠DAF=∠a=45°,∠EAF=∠B=30°,∠ABC=∠BCD=90°..DE...
.4a2=c2+46+2bc,即4a2=c2+46+2bc.①-7分99又由余弦定理得ad2=b2+c2-bc.②联立①②可得c=2b,a=√3b.--9分从而a2+b2=c2,故△ABC是直角三角形.-10分18.解:(1)f(x)=sinox...
肉为PE-号PD,所以PE=(分,得,则A正=AP+PE=(-日号3,…………………………………8分A在-3+3y+3=0,设平面ACE的法向量为n=(x,y,z),则n·AC=是2x2y=0.令x=√3,得n=(W3,-1,2W3).平...
19.已知等比数列{an}的各项均为正值,a3是4a、2a2的等差中项,45=32,记bn=l0g2a2-1·(1)求数列{an}和{bn}的通项公式;(2)设数列1b.b的前n项和为,证明:刀,<2,x...
炎德·英才·名校联考联合体2024届高三第二次联考▣口数学版权所注意事项:(意计议,造画的平比研不士列有义(八爱两设日1.答卷前,考生务必将自己的姓名、考生号、...
42.D。根据文中的Feeling ..he approached Peraota and asked why可知,Wilkins老师感到很好奇,走到Peraota跟前,问他为什么用左手操作鼠标。43.C。44.B。根据...
2版华师大八年级(河南)参考答案第2期数学周刊三、解答题(共52分)18.(11分)解:可归纳为:对于任何正整数n,多项式(6+n)2-15.(每小题3分,共9分)n2一定能被12...
(2)过点D分别作AB,AC的垂线,垂足分别为E,F,易知DE=DF=ADsin30°=√3,则号×Bb-号×3c=6sin60,化简得2-c6=0,解得c=3或c-一2(舍去),则6=6,由余弦定理得a=3W3,△ABC...
做题过程中,如何突破难点4版“方法点击”《学好视图的BEF=90GD票★4,B角形的性质第12期是在灯海光线(1)5学习方法报总第1377期②中小松树的2023年11月14日.D5.20星期...
团lL6c压I.用适当的介词或副词填空。1.The movie is very interesting.Why don't you come芳美在报社短along with us?EARNING ENGLISH2.Working outevery day is...
XI.One possible version:LostI lost my dog this morning.You can see it inthis photo.It is a white dog.And the name ofmy dog is Snow.I must find it.My p...
19:31:15⊙4念91l4l45∴该抛物线的函数表达式为y=-x-6)2+9,即y=-x2+3x:…4分(2)方案二的内部支架节省材料.理由如下:方案一:.OB=BW=NC=CM,OM=12米,3/5.OB=3米,0C...
PART CWhile traveling in India,Harry saw a rickshaw driverbuying some incense from someone on his way to the参考rickshaw.After Harry got into the rick...
第一节完形填空35.How does the author feel about theMary Amato was having an identity crisis(身份阅development of the vertical farming危机).She41_her j...
【答案】A Trashion ShowLast Saturday,our school auditorium witnessed a hot"trashion"show,a fashion showfeaturing outfits made of trash.The event was a...
INTO THE TEXTSAPart 2爱1.a2.contradictory第1.1.that2.that 3.why4.what 5.when3.was caused4.investigatingI.期5.who/that6.of/from期1.After the earthquake...
必修二UNIT5 TOPIC TALK,LESSONS1&2综合评估参考答案及部分解析参考答案1-5 BCBAA 6-10 CABAC11-15 BCABC 16-20 ACCBB21-25 ABDAD 26-30 CBBCC31-35 ADDBB 36-40...
直升机飞过儿时摘蓝莓的地方到去多伦多看一场棒球赛。56.D.Seniors can nominate themselves or be nominated by someone else;wishes arethen...by a community...
Ⅱ.词汇运用L.单项选择用括号内所给单词的适当形式填空。B)1.It's usually warm in the daytime,but during the21.Can you tell me by whom the talk will be giv...
答案: One possible version: Dear Lucy, I'm so glad to receive your email and know you're coming to my hometown in the winter vacation. You're welcome...
4.B根据最后一段Scheier说的话可知,Scheier认为Runway of Dreams Foundation在过去几年里取得的成绩归功于她对这个N 事业的热爱。
11.What did the man think was the most difficult part during the mountain climbing? A.The dangerous ice. B.The sharp rocks. C.The deep snow. 12.How lo...