已知z=ex2+xu-y2,求全微分dz.
举一反三
- 已知\(z = {x^2} + {y^2}\),则在\(\left( {2,1} \right)\)处的全微分dz = ( ) A: 8 B: 6 C: \(4dx + 2dy\) D: \(8dxdy\)
- 已知z= x²-arctan(x²+y²)则在(1,0)处全微分 dz=____。
- 已知z=3x²+x-y+ln(x²+y²)则在(1,1)处全微分 dz=____。
- 函数z=e^y/x全微分dz=
- z=cos(xy+y^2)()的全微分为()(2.0分)A.()dz=-sin(xy+y^2)(dx+dy)()B.()dz=-sin(xy+y^2)[ydx+(x+2y)dy]()C.()dz=-sin(xy+y^2)(y^2dx+xdy)()D.()dz=-sin(xy+y^2)[xydx+(x+y^2)dy]