课时跟踪检测(三十二) 数 列 求 和1.已知Sn是等差数列{an}的前n项和若S77S1575则数列{eq f(Snn)}的前20项和为________.2.数列{an}满足anan1eq f(12)(n∈N)a1-eq f(12)Sn是{an}的前n项和则S2 014________.3.已知函数f(n)n2cos nπ且anf(n)f(n1)则a1a2a3…a100_______
课时跟踪检测(三十三) 数 列 求 和1.已知{an}是首项为1的等比数列Sn是{an}的前n项和且9S3S6则数列eq blc{rc}(avs4alco1(f(1an)))的前5项和为( )A.eq f(158)或5 B.eq f(3116)或5C.eq f(3116) D.eq f(158)2.已知数列{an}的前n项和Snan2bn(ab∈R)且S2510
课时跟踪检测⑨(B2 Unit 2)Ⅰ.单项填空1.After ________ with the saleswoman I got the beautiful dress at the price of 50 yuan at .debating B.talkingC.discussing D.bargaining答案与解析:D bargain讨价还价debate辩论talk谈话di
课时跟踪检测(九) Wildlife protectionⅠ.多项选择1.I was trying to make friends with him but he didnt ________ my .appreciate B.evaluate C.defend D.reject 2.Those who suffer from headache will f
课时跟踪检测(三十) 等差数列及其前n项和1.(2014·泰州模拟)在等差数列{an}中若a3a9a2712则a13________.2.已知等差数列{an}满足a23Sn-Sn-351(n>3)Sn100则n的值为________.3.(2014·镇江月考)已知等差数列{an}中a4a610前5项和S55则其公差为________.4.已知Sn是等差数列{an}的前n项和S10>0并且S110若
课时跟踪检测(十二) Making JourneysⅠ.单项填空1.(2014·南开中学模拟)—I found the mark rather frightening.—________ It frightened me to death just .Thats reasonable advice. B.Isnt it a good ideaC.Do you think so D.I c
课时跟踪检测(十四) Developing and Developed CountriesⅠ.单项填空1.(2014·长春模拟)—Jenny what would you like to have for lunch pizza pasta or sushi— ________ I have a good .Sounds good. B.Youre so .Its up to you.
课时跟踪检测(十七) Great People and Great Inventions of Ancient ChinaⅠ.单项填空1.(2014·济南外国语学校模拟)There was ________ time when this kind of ________ music was very popular with .a the B.a C. the D. 2.(2014
课时跟踪检测(十五) The Violence of NatureⅠ.单项填空1.(2014·宝鸡模拟)The boss wanted an assistant with ________ knowledge of French and ________ work .a B.the theC.a the D.the 2.(2014·威海模拟) I was going t
课时跟踪检测(十三) EuropeⅠ.单项填空1.Tianjin ________120km southeast of Beijing is the largest coastal city in Northern .laid B.layingC.situated D.locating2.Most museums are just for today some of them
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