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近年来,从“彭宇案”掀起的轩然大波,到“扶老被诬伤老,好人败诉赔钱”等事件的一再发生,使历来推崇“助人为乐”的国人遭遇考验。2013年8月1日,《深圳特区救助人权益保护规定》的正式实施,填补了国内公民...
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行列式=
证明n阶矩阵相似
设函数fu具有2阶连续导数z=fexcosy满足若f0=0f′0=0求fu的表达式
设二次型fx1x2x3=x12-x22+2ax1x3+4x2x3的负惯性指数为1则a的取值范围是
设随机变量XY的概率分布相同X的概率分布为PX=0=PX=1=且XY的相关系数ρXY= 1求二维随机变量XY的联合概率分布 2求概率PX+Y≤1
Thinnerisn’talwaysbetter.Anumberofstudieshave__1___thatnormal-weightpeopleareinfactathigherriskofsomediseasescomparedtothosewhoareoverweight.Andtherearehealthconditionsforwhichbeingoverweightisactually___2___.Forexampleheavierwomenarelesslikelytodevelopcalciumdeficiencythanthinwomen.___3___amongtheelderlybeingsomewhatoverweightisoftenan___4___ofgoodhealth. Ofevengreater___5___isthefactthatobesityturnsouttobeverydifficulttodefine.Itisoftendefined___6___bodymassindexorBMI.BMI___7__bodymassdividedbythesquareofheight.AnadultwithaBMIof18to25isoftenconsideredtobenormalweight.Between25and30isoverweight.Andover30isconsideredobese.Obesity___8___canbedividedintomoderatelyobeseseverelyobeseandveryseverelyobese. Whilesuchnumericalstandardsseem9theyarenot.Obesityisprobablylessamatterofweightthanbodyfat.SomepeoplewithahighBMIareinfactextremelyfit10otherswithalowBMImaybeinpoor11.Forexamplemanycollegiateandprofessionalfootballplayers12asobesethoughtheirpercentagebodyfatislow.Converselysomeonewithasmallframemayhavehighbodyfatbuta13BMI. Todaywehaveaan_14_tolabelobesityasadisgrace.Theoverweightaresometimes_15_inthemediawiththeirfacescovered.Stereotypes_16_withobesityincludelazinesslackofwillpowerandlowerprospectsforsuccess.Teachersemployersandhealthprofessionalshavebeenshowntoharborbiasesagainsttheobese._17_veryyoungchildrentendtolookdownontheoverweightandteasingaboutbodybuildhaslongbeenaprobleminschools.
曲面z=x21-siny+y21-sinx在点101处的切平面方程为
Thinnerisn’talwaysbetter.Anumberofstudieshave__1___thatnormal-weightpeopleareinfactathigherriskofsomediseasescomparedtothosewhoareoverweight.Andtherearehealthconditionsforwhichbeingoverweightisactually___2___.Forexampleheavierwomenarelesslikelytodevelopcalciumdeficiencythanthinwomen.___3___amongtheelderlybeingsomewhatoverweightisoftenan___4___ofgoodhealth. Ofevengreater___5___isthefactthatobesityturnsouttobeverydifficulttodefine.Itisoftendefined___6___bodymassindexorBMI.BMI___7__bodymassdividedbythesquareofheight.AnadultwithaBMIof18to25isoftenconsideredtobenormalweight.Between25and30isoverweight.Andover30isconsideredobese.Obesity___8___canbedividedintomoderatelyobeseseverelyobeseandveryseverelyobese. Whilesuchnumericalstandardsseem9theyarenot.Obesityisprobablylessamatterofweightthanbodyfat.SomepeoplewithahighBMIareinfactextremelyfit10otherswithalowBMImaybeinpoor11.Forexamplemanycollegiateandprofessionalfootballplayers12asobesethoughtheirpercentagebodyfatislow.Converselysomeonewithasmallframemayhavehighbodyfatbuta13BMI. Todaywehaveaan_14_tolabelobesityasadisgrace.Theoverweightaresometimes_15_inthemediawiththeirfacescovered.Stereotypes_16_withobesityincludelazinesslackofwillpowerandlowerprospectsforsuccess.Teachersemployersandhealthprofessionalshavebeenshowntoharborbiasesagainsttheobese._17_veryyoungchildrentendtolookdownontheoverweightandteasingaboutbodybuildhaslongbeenaprobleminschools.
设α1α2α3为3维向量则对任意常数kl向量组α1+kα3α2+lα3线性无关是向量组α1α2α3线性无关的
已知函数y=yx满足微分方程x2+y2y′=1-y′且y2=0求yx的极大值与极小值
求极限
曲线上对应于t=1的点处的曲率半径是
Thinnerisn’talwaysbetter.Anumberofstudieshave__1___thatnormal-weightpeopleareinfactathigherriskofsomediseasescomparedtothosewhoareoverweight.Andtherearehealthconditionsforwhichbeingoverweightisactually___2___.Forexampleheavierwomenarelesslikelytodevelopcalciumdeficiencythanthinwomen.___3___amongtheelderlybeingsomewhatoverweightisoftenan___4___ofgoodhealth. Ofevengreater___5___isthefactthatobesityturnsouttobeverydifficulttodefine.Itisoftendefined___6___bodymassindexorBMI.BMI___7__bodymassdividedbythesquareofheight.AnadultwithaBMIof18to25isoftenconsideredtobenormalweight.Between25and30isoverweight.Andover30isconsideredobese.Obesity___8___canbedividedintomoderatelyobeseseverelyobeseandveryseverelyobese. Whilesuchnumericalstandardsseem9theyarenot.Obesityisprobablylessamatterofweightthanbodyfat.SomepeoplewithahighBMIareinfactextremelyfit10otherswithalowBMImaybeinpoor11.Forexamplemanycollegiateandprofessionalfootballplayers12asobesethoughtheirpercentagebodyfatislow.Converselysomeonewithasmallframemayhavehighbodyfatbuta13BMI. Todaywehaveaan_14_tolabelobesityasadisgrace.Theoverweightaresometimes_15_inthemediawiththeirfacescovered.Stereotypes_16_withobesityincludelazinesslackofwillpowerandlowerprospectsforsuccess.Teachersemployersandhealthprofessionalshavebeenshowntoharborbiasesagainsttheobese._17_veryyoungchildrentendtolookdownontheoverweightandteasingaboutbodybuildhaslongbeenaprobleminschools.
设总体X的分布函数其中θ为未知参数且大于零X1X2…Xn为来自总体的简单随机样本 Ⅰ求EX与EX2 Ⅱ求θ的最大似然估计量 Ⅲ是否存在实数a使得对任何ε>0都有
下列曲线中有渐近线的是
设函数uxy在有界闭区域D上连续在D的内部具有2阶连续偏导数且满足及则
设E为3阶单位矩阵 I求方程组Ax=0的一个基础解系 II求满足AB=E的所有矩阵B
设二次型fx1x2x3=x12-x22+2ax1x3+4x2x3的负惯性指数是1则a的取值范围为
设函数fu二阶连续可导z=fexcosy满足若f0=0f′0=0求fu的表达式
Thinnerisn’talwaysbetter.Anumberofstudieshave__1___thatnormal-weightpeopleareinfactathigherriskofsomediseasescomparedtothosewhoareoverweight.Andtherearehealthconditionsforwhichbeingoverweightisactually___2___.Forexampleheavierwomenarelesslikelytodevelopcalciumdeficiencythanthinwomen.___3___amongtheelderlybeingsomewhatoverweightisoftenan___4___ofgoodhealth. Ofevengreater___5___isthefactthatobesityturnsouttobeverydifficulttodefine.Itisoftendefined___6___bodymassindexorBMI.BMI___7__bodymassdividedbythesquareofheight.AnadultwithaBMIof18to25isoftenconsideredtobenormalweight.Between25and30isoverweight.Andover30isconsideredobese.Obesity___8___canbedividedintomoderatelyobeseseverelyobeseandveryseverelyobese. Whilesuchnumericalstandardsseem9theyarenot.Obesityisprobablylessamatterofweightthanbodyfat.SomepeoplewithahighBMIareinfactextremelyfit10otherswithalowBMImaybeinpoor11.Forexamplemanycollegiateandprofessionalfootballplayers12asobesethoughtheirpercentagebodyfatislow.Converselysomeonewithasmallframemayhavehighbodyfatbuta13BMI. Todaywehaveaan_14_tolabelobesityasadisgrace.Theoverweightaresometimes_15_inthemediawiththeirfacescovered.Stereotypes_16_withobesityincludelazinesslackofwillpowerandlowerprospectsforsuccess.Teachersemployersandhealthprofessionalshavebeenshowntoharborbiasesagainsttheobese._17_veryyoungchildrentendtolookdownontheoverweightandteasingaboutbodybuildhaslongbeenaprobleminschools.
设数列{an}{bn}满足0<an<0<bn<cosan-an=cosbn且级数收敛 Ⅰ证明=0 Ⅱ证明收敛
设fx是周期为4的可导奇函数且f′x=2x-1x∈[02]则f7=
下列曲线中有渐近线的是
Thinnerisn’talwaysbetter.Anumberofstudieshave__1___thatnormal-weightpeopleareinfactathigherriskofsomediseasescomparedtothosewhoareoverweight.Andtherearehealthconditionsforwhichbeingoverweightisactually___2___.Forexampleheavierwomenarelesslikelytodevelopcalciumdeficiencythanthinwomen.___3___amongtheelderlybeingsomewhatoverweightisoftenan___4___ofgoodhealth. Ofevengreater___5___isthefactthatobesityturnsouttobeverydifficulttodefine.Itisoftendefined___6___bodymassindexorBMI.BMI___7__bodymassdividedbythesquareofheight.AnadultwithaBMIof18to25isoftenconsideredtobenormalweight.Between25and30isoverweight.Andover30isconsideredobese.Obesity___8___canbedividedintomoderatelyobeseseverelyobeseandveryseverelyobese. Whilesuchnumericalstandardsseem9theyarenot.Obesityisprobablylessamatterofweightthanbodyfat.SomepeoplewithahighBMIareinfactextremelyfit10otherswithalowBMImaybeinpoor11.Forexamplemanycollegiateandprofessionalfootballplayers12asobesethoughtheirpercentagebodyfatislow.Converselysomeonewithasmallframemayhavehighbodyfatbuta13BMI. Todaywehaveaan_14_tolabelobesityasadisgrace.Theoverweightaresometimes_15_inthemediawiththeirfacescovered.Stereotypes_16_withobesityincludelazinesslackofwillpowerandlowerprospectsforsuccess.Teachersemployersandhealthprofessionalshavebeenshowntoharborbiasesagainsttheobese._17_veryyoungchildrentendtolookdownontheoverweightandteasingaboutbodybuildhaslongbeenaprobleminschools.
Thinnerisn’talwaysbetter.Anumberofstudieshave__1___thatnormal-weightpeopleareinfactathigherriskofsomediseasescomparedtothosewhoareoverweight.Andtherearehealthconditionsforwhichbeingoverweightisactually___2___.Forexampleheavierwomenarelesslikelytodevelopcalciumdeficiencythanthinwomen.___3___amongtheelderlybeingsomewhatoverweightisoftenan___4___ofgoodhealth. Ofevengreater___5___isthefactthatobesityturnsouttobeverydifficulttodefine.Itisoftendefined___6___bodymassindexorBMI.BMI___7__bodymassdividedbythesquareofheight.AnadultwithaBMIof18to25isoftenconsideredtobenormalweight.Between25and30isoverweight.Andover30isconsideredobese.Obesity___8___canbedividedintomoderatelyobeseseverelyobeseandveryseverelyobese. Whilesuchnumericalstandardsseem9theyarenot.Obesityisprobablylessamatterofweightthanbodyfat.SomepeoplewithahighBMIareinfactextremelyfit10otherswithalowBMImaybeinpoor11.Forexamplemanycollegiateandprofessionalfootballplayers12asobesethoughtheirpercentagebodyfatislow.Converselysomeonewithasmallframemayhavehighbodyfatbuta13BMI. Todaywehaveaan_14_tolabelobesityasadisgrace.Theoverweightaresometimes_15_inthemediawiththeirfacescovered.Stereotypes_16_withobesityincludelazinesslackofwillpowerandlowerprospectsforsuccess.Teachersemployersandhealthprofessionalshavebeenshowntoharborbiasesagainsttheobese._17_veryyoungchildrentendtolookdownontheoverweightandteasingaboutbodybuildhaslongbeenaprobleminschools.
曲线L的极坐标方程是r=θ则L在点rθ=处的切线的直角坐标方程是
设随机事件A与B相互独立且PB=0.5PA-B=0.3则PB-A=
设fxy是连续函数则=
设函数fx=x∈[01]定义数列f1x=fxf2x=ff1x…fnx=ffn-1x… 记Sn是由曲线y=fnx直线x=1及x轴所围平面图形的面积求极限
微分方程xy′+ylnx-lny=0满足条件y1=e3的解为y=
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