2018考研数二真题及答案

去百度文库，查看完整内容>内容来自用户:杨晓霞大本营2018年全国硕士研究生入学统一考试数学二试题解析一、选择题：1～8小题，每小题4分，共32分，下列每小题给出的四个选项中，只有一项符合题目要求的，请将所选项前的字母填在答题纸指定位置上.（1）若,则（）【答案】B（2）下列函数中,在处不可导是（）【答案】D（3）设函数，,若在上连续,则（）【答案】D（4）设函数在[0,1]上二阶可导,且,则（A）当时,（B）当时,（C）当时,（D）当时,【答案】D（5）设,,,则的大小关系为（A）（B）（C）（D）【答案】C（6）（A）（B）（C）（D）【答案】C（7）下列矩阵中,与矩阵相似的为【答案】A（8）设为n阶矩阵,记为矩阵的秩，表示分块矩阵，则（A）（B）（C）（D）【答案】A二、填空题：914小题，每小题4分，共24分，请将答案写在答题纸指定位置上.(9)_______(10)曲线在其拐点处的切线方程是______(11)_______(12)曲线在对应点的曲率为（13）设函数由方程确定，则（14）设为3阶矩阵，为线性无关的向量组，若，则的实特征值为【答案】2三、解答题：15—23小题，共94分.请将解答写在答题纸指定位置上.解答应写出文字说明、证明过程或演算步骤.（15）（本题满分10分）求不定积分（16）（本题满分（

去百度文库，查看完整内容>内容来自用户:2715749122018年全国硕士研究生入学统考试英语(二)试题2018年全国硕士研究生入学统考试英语(二)试题SectionIUseofEnglishDirections:Readthefollowingtext.Choosethebestword(s)foreachnumberedblankandmarkA,B,CorDontheANSWERSHEET.(10points)rthingsthatwillobviouslyhepainful?Becausehumanshaveaninherentneedto1uncertainty,accordingtoarecentstudyinPsychologicalScience.thatpeoplewill2_rwill3.Inaseriesoffourexperiments,testedstudents'fforttosatisfycuriosity.Forone5_,herclaimedwerefronapreviousexperiment.Thetwist?Halfofthepenswould6anelectricshockwhenclicked.Twenty-sevenstudentsweretoldwhichpenswererigged;anothertwenty-sevenweretoldonlythatsomewereelectrified.7leftaloneintheroom,thestudentswho

去百度文库，查看完整内容>内容来自用户:跨考考研Borntowin2018年考研英语二试题与答案解析（完整版）——跨考教育英语教研室SectionIUseofEnglishDirections：Readthefollowingtext.Choosethebestword(s)foreachnumberedblankandmarkA,B,CorDontheANSWERSHEET.(10points)rthingsthatwillobviouslybepainful?Becausehumanshaveaninherentneedto1uncertainty,accordingtoarecentstudyinPsychologicalScience.iscleartheanswerwill3.Inaseriesoffourexperiments,heWisconsinSchoolofBusinesstestedstudents'fforttosatisfycuriosity.Forone,cherclaimedwerefromapreviousexperiment.Thetwist?Halfofthepenswould6anelectricshockwhenclicked.Twenty-sevenstudentsweretoldwhichpenswereelectrified;anothertwenty-neintheroom,thestudentswhodidnotknowwhichoneswoul

去百度文库，查看完整内容>内容来自用户:今生无悔xy本科院校目标院校目标专业姓名.....................................装.......................................订.......................................线.......................................2018年全国硕士研究生统一入学考试数学二试题整理人：中博考研向禹老师xy123@mail.ustc.e.cn题号1-89-14151617181920212223总分分数评卷人一、得分选择题（每题4分,共32分）1.若lim(ex+ax2+)1bxx2=1，则x→011A.a=,b=−1B.a=−,b=−122【解析】由条件得1C.a=,b=12()1D.a=−,b=12()()lnex+ax2+bxln1+ex−1+ax2+bxex−1+ax2+bx0==limx→0limx→0x+x212x2+o(x2)x2=limx→0+ax2+bx=limx→0x2(1+b)x+(12=lim+)ax→0x2+x2o(x2)x2因此b=−1,a=1−.22.下列函数不可导的是A.f(x)=xsinx√B.f(x)=xsinxC.f(x)=cosx()√D.f(x)=cosx【解析】A,B,C可导,D根据导数的定义可得f+′(0)=−12,f−′(0)=1.2−1,3.设函数f(x)=1,x<02−ax,x⩾0,g(x)=xx,−b,x⩽−1−1<x<0,若f(x)

去百度文库，查看完整内容>内容来自用户:彻工业布局睬磷2018考研英语（二）真题及参考答案（完整版）来源：文都教育SectionⅠ Use of EnglishDirections:Read the following text. Choose the best word(s) for each numbered blank and mark[A],[B],[C]or[D]on the ANSWER SHEET. (10 points)Why do people read negative Internet comments and do other things that willobviously be painful? Because humans have an inherent need to1uncertainty, according to a recent study inPsychological Science. The new research reveals that the need to know is strong that people will2to satisfy their curiosity even when it is clear the answer will3.In a series of experiments,behavioralscientists at the University of Chicago and theWisconsin school of Business tested students’ willingness to4themselves to unpleasant stimuli in an effortto satisfy curiosity. For one5, each participant was shown a pile of pens that the researcher claimed were from a previous experiment. The twist? Half of the pens would6an electric shock when clicked.Twenty-seven students were told with pens were electrified; another twenty-seven were told only that some were electrified.7left alone in the room. The students who did not know which ones would shock them clicked mor

去百度文库，查看完整内容>内容来自用户:今生无悔xy本科院校目标院校目标专业姓名.....................................装.......................................订.......................................线.......................................2018年全国硕士研究生统一入学考试数学一试题整理人：中博考研向禹老师xy123@mail.ustc.e.cn题号分数1-89-14151617181920212223总分评卷人一、得分选择题（每题4分,共32分）1.下列函数不可导的是C.f(x)=cosx′1′1【解析】A,B,C可导,D根据导数的定义可得f+(0)=−,f−(0)=.222.过点(1,0,0)与(0,1,0)且与z=x2+y2相切的平面方程为A.z=0与x+y−z=1B.z=0与2x+2y−z=0C.y=x与x+y−z=1A.f(x)=xsinxB.f(x)=xsin√()xD.f(x)=cos√x(D.y=x与2x+2y−z=2)【解析】过点(1,0,0)与(0,1,0)且与已知曲面相切的平面只有两个,显然z=0与曲面z=x2+y2相切,故排除C,D.11曲面z=x2+y2的法向量为(2x,2y,−1),对于A选项,x+y−z=1的法向量为(1,1,−1),可得x=,y=.代入2222z=x+y和x+y−z=1中z不相等,排除A,故选B.3.n=0∑(−1)n(2n+1)!B.2sin1+cos1C.2sin1+2cos1D.3sin1+2cos1∞2n

一般来说工学类中的纺织科学与工程、轻工技术与工程、农业工程、林业工程、食品科学与工程等5个一级学科中的二级学科和专业均要求使用是数学二考试试卷。除此之外，还有一些工科类要求的数学试卷难易程度是由招生单位决定的，比如材料科学与工程、化学工程与技术、地质资料与地质工程、矿业工程、石油与天然气工程、环境科学与工程等一级学科，对数学要求高的二级学科则选取数学一，要求较低的则选取数学二。

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考研大纲一般在7月下月，8月上中旬才会公布，然后各校公布招生简章，招生目录。10月份网上报名，11月份现场确认。考研大纲一般8月下旬出版，供参考