向量场A(x,3x,2y)在点M(x,y,z)处的旋度rotA()
举一反三
- (2分)向量场A=3yi-2zj+xk在点(x,y,z)处的旋度rotA=____.
- (2分)向量场A={x,xy,xyz}在点M(2,-1,2)处的旋度rotA|M=____.
- 设\(z = u{e^v}\),\(u = {x^2} + {y^2}\),\(v = xy\),则\( { { \partial z} \over {\partial y}}=\)( )。 A: \({e^{xy}}({x}y^2 + {x^3} + 2y)\) B: \({e^{xy}}({x^2}y + {x^3} + 2y)\) C: \({e^{xy}}({x}y^2 + {x^3} + 2x)\) D: \({e^{xy}}({x}y+ {x^3} + 2y)\)
- 已知int x=1,y=2,z=3;以下语句执行后x,y,z的值是( ). if(x>y) z=x; x=y; y=z; A: x=1, y=2, z=3 B: x=2, y=3, z=3 C: x=2, y=3, z=1 D: x=2, y=3, z=2
- 已知int x=1,y=2,z=3;执行if(x>y) z=x;x=y;y=z;后x,y,z的值为( ) A: x=1,y=2,z=3 B: x=2,y=3,z=3 C: x=2,y=3,z=1 D: x=2,y=3,z=2