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:()
设 https://assets.asklib.com/psource/2015102711231299538.jpg ,令u=arctan https://assets.asklib.com/psource/2015102711231333386.jpg ,dv=dx,用分部积分计算,则I利用分部积分公式后是下列中哪个()? https://assets.asklib.com/psource/2015102711232357404.jpg
设L是以A(-1,0)、B(-3,2)、C(3,0)为顶点的三角形边界,沿ABCA方向,则曲线积分 https://assets.asklib.com/psource/2015102616094496675.jpg (3x-y)dx+(x-2y)dy等于()
不定积分 https://assets.asklib.com/psource/2016071617291113666.jpg 等于:() https://assets.asklib.com/psource/2016071617291897939.jpg
曲线积分 https://assets.asklib.com/psource/201510261614448891.jpg (3dx+dy)/(|x|+|y|),其中L为由点(1,0)经(0,1)至(-1,0)的折线,则其值是:() https://assets.asklib.com/psource/2015102616144657348.jpg
曲线积分 https://assets.asklib.com/psource/2015102616134895753.jpg ,其中L是从A(0,0)沿y=sinx到点B(π/2,1)的曲线段,则其值是:()
广义积分, https://assets.asklib.com/psource/2016071617423385400.jpg 等于:() https://assets.asklib.com/psource/2016071617430065536.jpg
定积分 https://assets.asklib.com/psource/2016071617404855668.jpg 等于:()
定积分 https://assets.asklib.com/psource/2016071616222524760.jpg () https://assets.asklib.com/psource/2016071616223275921.jpg
二次积分 https://assets.asklib.com/psource/2015102917004746434.jpg 交换积分次序后的二次积分是()。
反常积分 https://assets.asklib.com/psource/2016071616303531159.jpg ()
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()
设L是以0(0,0),A(1,0)和B(0,1)为顶点的三角形区域的边界,则曲线积分 https://assets.asklib.com/psource/2015102915232744778.jpg 的值是().
定积分 https://assets.asklib.com/psource/2016071616210527033.jpg ()
设D是由曲线xy=1及直线x=2,y=1所围成的平面区域,则二重积分 https://assets.asklib.com/psource/2016071616352157761.jpg () https://assets.asklib.com/psource/2016071616351311187.jpg
反常积分 https://assets.asklib.com/psource/2016071616284189387.jpg ()
设C为椭圆 https://assets.asklib.com/psource/2015102915241420198.jpg 其周长记为a,则曲线积分 https://assets.asklib.com/psource/2015102915243447962.jpg 的值是().
不定积分 https://assets.asklib.com/psource/2016071616235565881.jpg () https://assets.asklib.com/psource/2016071616241143872.jpg
不定积分 https://assets.asklib.com/psource/201607161625293907.jpg () https://assets.asklib.com/psource/2016071616253628269.jpg
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:()
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 ()
D是平面区域https://assets.asklib.com/source/1472203247858014244.png ,则二重积分 https://assets.asklib.com/source/1472203259343037817.png ()。
不定积分 https://assets.asklib.com/psource/2016071616263691568.jpg () https://assets.asklib.com/psource/2016071616264514745.jpg
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:()