当无差异曲线为分别平行于X、Y轴的直角形时表明,X和Y的关系为()
D是由曲线和直线y=-x围成的区域为。<img src="http://p.ananas.chaoxing.com/star3/origin/c716a05b52b885842a49fbc4833ecd82.png"/> <img src="http://p.ananas.chaoxing.com/star3/origin/f8e44f6f8c46e8dbd3c3993c297115ac.png"/>
设一条半径为a的上半圆形金属丝,质量均匀分布,它的质心坐标为<img src="http://p.ananas.chaoxing.com/star3/origin/ff81482354cbb718211fc76d98bf6702.png"/>
曲线弧对x轴的转动惯量 <img src='\"http://p.ananas.chaoxing.com/star3/origin/3c4bcb05cf8f74d3988e20a9468fcecc.png\"/'/>
曲线 z=x 2 +y 2 ,y=1,在(1,1)处的切线与x轴的夹角为()度。
设函数<img src='https://img2.soutiyun.com/latex/latex.action' />,则y有( ).
用普通计量器具测量<img src='https://img2.soutiyun.com/ask/2020-02-29/951815154752942.png' />轴。按GB/T 3177—2009的规定,安全裕度为0.0062mm,轴的上验收极限为( )。
若u,v为x,y的函数,x=rcosθ,y=rsinθ,试由<img src='https://img2.soutiyun.com/ask/2021-01-26/980518171905549.png' />
求曲线在点(1,1,√3)处的切线与y轴的正向之间的夹角。
用公式法将函数Y化简为最简与或式:<img src='https://img2.soutiyun.com/latex/latex.action' />
设随机变量(X,Y)的密度函数为<img src='https://img2.soutiyun.com/latex/latex.action' />
由<img src='https://img2.soutiyun.com/latex/latex.action' />,确定可微函数z=z(x,y)(f也可微),则<img src='https://img2.soutiyun.com/latex/latex.action' />=( )
设曲线<img src='https://img2.soutiyun.com/latex/latex.action' />,则曲线______
5.直线<img src='https://img2.soutiyun.com/latex/latex.action' />与平面x-y-z-5=0的关系是( )
由曲线<img src='https://img.soutiyun.com/ask/zq/20210726/996181355285648.png' />和直线y=4x,x=2,y=0所围成的平面图形的面积为()。
设y=cos(arcsinx/2),则y′(<img src='https://img2.soutiyun.com/shangxueba/ask/17682001-17685000/17682641/2015102617240647220.jpg' />/2)的值等于()
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:()
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' />
设直线L1:4x+y-4=0,L2:2x-8y+15=0,<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18736916/2016071615331659182.jpg' />为曲线C:y=<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18736916/2016071615331885551.jpg' />上的一点,则()
图所示正方形截面对要y<sub>1</sub>轴的惯性矩应为:()<img src='https://img2.soutiyun.com/shangxueba/ask/18996001-18999000/18998513/2016071911540243761.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18996001-18999000/18998513/2016071911540550249.jpg' />
若系统<img src='https://img2.soutiyun.com/ask/2020-02-27/951684916952625.png' />,y=[0 1]x,则该系统( )。
下图中红色曲线表明的是()特性曲线。<img src='https://img2.soutiyun.com/shangxueba/ask/2022-04/11/642/20220411085133627.png' />
【计算题】求曲线y=lnx在点(e,1)处的切线与y轴的交点。
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:()