设L为|x|+|y|=1正向一周,则 https://assets.asklib.com/psource/2015102616184650790.jpg (-ydx+xdy)/(|x|+|y|)的值为:() https://assets.asklib.com/psource/2015102616184896461.jpg
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设L是从A(1,0)到B(-1,2)的线段,则曲线积分 https://assets.asklib.com/psource/201510271143115588.jpg (x+y)ds等于:()
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设随机变量126X,X,L,X的期望均为0,方差均为1,且任意两个随机变量的相关系数都为1/3,令123Y=X+X+X,456Z=X+X+X,则Y与Z的相关系数为()。
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设L是从点(0,0)沿y=1-|x-1|至点(2,0)的折线段,则曲线积分 https://assets.asklib.com/psource/2015102616112131846.jpg -ydx+rdy等于()
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设y=(1+x) https://assets.asklib.com/psource/2015102617285032051.jpg ,则y′(1)等于:()
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曲线积分 https://assets.asklib.com/psource/2015102616173921463.jpg -2x 3 ydx+x 2 y 2 dy,其中L是由不等式x 2 +y 2 ≥1及x 2 +y 2 ≤2y所确定的区域D的正向边界,则其值为:()
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设f(x,y)为连续函数,则https://assets.asklib.com/source/1473388983424078956.png()。
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设D是矩形区域:0≤x≤π/4,-1≤y≤1,则 https://assets.asklib.com/psource/2015102711413831375.jpg xcos2xydxdy等于:()
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设L是连接A(1,0),B(0,1),C(-1,0)的折线,则曲线积分 https://assets.asklib.com/psource/2015102817302620589.jpg [(dx+dy)/(|x|+|y|)]的值为:()
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设L为圆周x 2 +y 2 =a 2 (a>0),则曲线积分 https://assets.asklib.com/psource/201607161642571026.jpg ()
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设D是由不等式|x|+|y|≤1所确定的有界区域,则二重积分 https://assets.asklib.com/psource/2015102711415856435.jpg |x|dxdy的值是:()
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设L是以O(0,0)、A(1,0),B(0,1)为顶点的三角形的边界,则 https://assets.asklib.com/psource/2015102616023895987.jpg (x+y)ds的值为()
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L是区域D:x 2 +y 2 ≤-2x的正向周界,则 https://assets.asklib.com/psource/201510261612581150.jpg (x 3 -y)dx+(x-y 2 )dy等于:()
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设L是由圆周x 2 +y 2 =a 2 ,直线x=y,及x轴在第一象限中所围成的图形的边界,则 https://assets.asklib.com/psource/2015102616082752802.jpg https://assets.asklib.com/psource/2015102616082839763.jpg 的值是:() https://assets.asklib.com/psource/2015102616083033064.jpg
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设A为曲线y=2x-x 2 与x轴所围平面的图形,则A绕x轴旋转一周而成的旋转体的体积为V=() https://assets.asklib.com/psource/201607161647038510.jpg
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设L是圆周x 2 +y 2 =a 2 (a>0)负向一周,则曲线积分 https://assets.asklib.com/psource/2015102616160584974.jpg (x 3 -x 2 y)dx+(xy 3 -y 3 )dy的值为:()
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设L是圆周x<sup>2</sup>+y<sup>2</sup>=a<sup>2</sup>(a>0)负向一周,则曲线积分<img src='https://img2.soutiyun.com/shangxueba/ask/17682001-17685000/17682241/2015102616160584974.jpg' />(x<sup>3</sup>-x<sup>2</sup>y)dx+(xy<sup>3</sup>-y<sup>3</sup>)dy的值为:()
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设L为|x|+|y|=1正向一周,则<img src='https://img2.soutiyun.com/shangxueba/ask/17682001-17685000/17682260/2015102616184650790.jpg' />(-ydx+xdy)/(|x|+|y|)的值为:()<img src='https://img2.soutiyun.com/shangxueba/ask/17682001-17685000/17682260/2015102616184896461.jpg' />
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设随机变量X服从参数为3的泊松分布,Y服从参数为1/5的指数分布,且X,Y相互独立,则D(X-2Y+1)=()。
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L是区域D:x<sup>2</sup>+y<sup>2</sup>≤-2x的正向周界,则<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17672639/201510261612581150.jpg' />(x<sup>3</sup>-y)dx+(x-y<sup>2</sup>)dy等于:()
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设l是从点(0,0)沿y=1-|x-1|至点(2,0)的折线段,则曲线积分
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设L是从A(1,0)到B(-1,2)的线段,则曲线积分<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17672554/201510271143115588.jpg' />(x+y)ds等于:()
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设L为正向圆周x^2+y^2=2在第一象限中的部分,则曲线积分∫Lxdy-2ydx的值为()
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设A-(2)B-1.2.3.4.5).A到B的关系R={(x,y)|x∈A,y∈B且x+1-y},则R=().<img src='https://img2.soutiyun.com/shangxueba/ask/68967001-68970000/68967597/994768172395882.png' />
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一平面简谐波沿x轴正向传播,已知x=L(L<λ)处质点的振动方程为y=Acosωt,波速为u,则波动方程为()