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Directions : Write an essay of 160-200 words based on the following drawing. In your essay, you sho...
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Directions:Inthispartyouaretowriteanessayof160—200
Directions: Studythepictureabovecarefullyandwrite
PartB Directions: Youarerequiredtowriteanessayont
Directions:Studythepictureabovecarefullyandwritean
Directions:Writeanessayof160-200wordsbasedonthefo
Directions:Studythepictureabovecarefullyandwritean
Directions: Writeanessayof160-200wordsbasedonthef
Directions: Studythepicturesabovecarefullyandwrit
Directions:Studythepicturesabovecarefullyandwritea
Directions:Studythepictureabovecarefullyandwritean
Directions: Studythepictureabovecarefullyandwrite
Directions:Studythepictureabovecarefullyandwritean
Directions: Studythepictureabovecarefullyandwrite
Directions:Writeanessayof160-200wordsbasedonthefo
Directions: Youarerequiredtowriteanessayoffthetop
Directions:Writeanessayof160-200wordsbasedonthefo
Directions:Studythetwopicturesabovecarefullyandwri
Directions:Studythepictureabovecarefullyandwritean
Directions:Writeanessayof160-200wordsbasedonthefol
Directions:Studythepictureabovecarefullyandwritean
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设二维随机变量XY的概率密度为fxy=Ae-x2+xy-y2-∞＜x＜+∞-∞＜y＜+∞求Ⅰ常数AⅡfxzⅢfY|Xy|xⅣcovXY．
设区域D由直线y=2-x曲线x2+y2=2y以及z轴在第一象限围成求
袋中有8个球其中有3个白球5个黑球从中随意取出4个球如果4个球中有2个白球2个黑球试验停止否则将4个球放回袋中重新抽取4个球直至取到2个白球2个黑球为止．用X表示抽取次数则EX=______
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已知随机变量X的概率密度为在X＝xx＞0的条件下随机变量Y在区间0x上服从均匀分布求Ⅰ随机变量X与Y的联合概率密度fxyX与Y是否独立为什么Ⅱ计算条件概率Ⅲ求证Z=X-Y服从参数λ＝1的指数分布．
计算二重积分其中D是直线x+y=2与圆x2+y2=2x在第一象限围成的平面区域．
设3阶实对称矩阵A的秩为2λ1=λ2=6是A的二重特征值．若α1=1a0Tα2=211Tα3=01-1T都是矩阵A属于特征值6的特征向量．Ⅰ求a的值Ⅱ求A的另一特征值和对应的特征向量Ⅲ若β=-22-1T求Anβ．
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设ab是满足b＞a＞1的两个常数确定p与q的值使得Ⅰ当x∈[ab]时px+q≥lnxⅡ取得最小值．
差分方程yt+1+5yt=18t2+6t+3的通解是______．
证明当x∈01时成立．
Atworkasinlifeattractivewomengetalotofgoodlucks.Studieshaveshownthattheyaremorelikelytobe1thantheirplain-Janecolleaguesbecausepeopletendtoproject2traits3themsuchasasensitiveheartandacoolheadtheymayalsobeatan4injobinterviews.Butresearchsuggestsotherwise. BradHanksatGeorgiaStateUniversitylookedatwhathappenswhenjobhuntersincludephotoswiththeirresumeasisthe5inmuchofEuropeandAsia.Thepairsentmade-upapplicationstoover2500real-life6.Foreachjobtheysenttwoverysimilarresumeonewithaphotoonewithout.Subjectshadpreviouslybeengradedfortheirattractiveness. Formentheresultswere7expected.Hunksweremorelikelytobecalledforaninterviewiftheyincludedaphoto.Uglymenwerebetteroffnotincludingone.Howeverforwomenthiswas8.Attractivefemaleswerelesslikelytobeofferedaninterviewiftheyincludedamugshot.Whenapplyingdirectlytoacompanyratherthanthroughanagencyanattractivewomanwouldneedtosendout11CVsonaverage9gettinganinterview;an10qualifiedplainonejustseven. AtfirstMr.Hanksconsidered11hecallsthe"dumb-blondehypothesis"thatpeople12beautifulwomentobestupid.13thephotoshadalsobeenratedonhow14peoplethoughteachsubjectlooked;therewasno15betweenperceivedintellectandbeauty. Sothecauseofthediscriminationmust16elsewhere.Humanresourcesdepartmentstendtobe17mostlybywomen.IndeedintheIsraelistudy93%ofthosetaskedwithselectingwhomtoinviteforaninterviewwerefemale.Theresearchers’unavoidable—andunpalatable—conclusionisthatold-fashioned18ledthewomentodiscriminate19prettycandidates. SoshouldattractivewomensimplyattachphotosthatmakethemlookdowdyNo.BettersaysMr.Ruffletodiscouragethepracticeofincludingaphotoaltogether.Companiesmightevenconsiderthe20modelusedintheBelgianpublicsectorwhereCVsdonotevenincludethecandidate’sname. 2
已知矩阵可逆A*是A的伴随矩阵是A*的特征向量．Ⅰ求A*的特征值与特征向量Ⅱ判断A*能否相似对角化如能则求可逆矩阵P使P-1A*P=A如不能则说明理由．
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设连续函数fx满足方程求fx的表达式．
设函数fx在[1+∞上连续并使反常积分收敛若fx还满足则fx=______.
设函数fx在[01]上连续在01内可导且f0f1＜0．求证存在ζ∈01使得ζf’ζ+4-ζ2fζ=0．
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