2、曲线[img=50x26]1803bbf5246ec8d.png[/img]绕y轴旋转的曲面方程为( )
A: [img=96x26]1803bbf52c47c0a.png[/img]
B: [img=89x26]1803bbf534d29f6.png[/img]
C: [img=88x26]1803bbf53d54c96.png[/img]
D: [img=88x26]1803bbf54528894.png[/img]
A: [img=96x26]1803bbf52c47c0a.png[/img]
B: [img=89x26]1803bbf534d29f6.png[/img]
C: [img=88x26]1803bbf53d54c96.png[/img]
D: [img=88x26]1803bbf54528894.png[/img]
举一反三
- 2、曲线[img=50x26]1803bbf4af2ab33.png[/img]绕y轴旋转的曲面方程为( ) A: [img=96x26]1803bbf4b8104c5.png[/img] B: [img=89x26]1803bbf4c0e7539.png[/img] C: [img=88x26]1803bbf4c98f10e.png[/img] D: [img=88x26]1803bbf4d253f24.png[/img]
- xOy坐标面上的曲线[img=82x26]1803bbf204cb79f.png[/img]绕x轴旋转一周,所得的旋转曲面方程为( ) A: [img=88x26]1803bbf20cf1208.png[/img] B: [img=89x26]1803bbf21559fe6.png[/img] C: [img=88x26]1803bbf21dbee2c.png[/img] D: [img=96x26]1803bbf227da55f.png[/img]
- 设函数z = f(x,y)有[img=60x49]1803d33efaee3b2.png[/img],且[img=185x29]1803d33f0393bc0.png[/img],则f(x,y)=( ) A: [img=89x26]1803d33f0c49099.png[/img] B: [img=89x26]1803d33f154664f.png[/img] C: [img=96x26]1803d33f1d47d11.png[/img] D: [img=96x26]1803d33f25a18de.png[/img]
- 设随机变量X、Y相互独立,且[img=265x35]1786a06017102c9.png[/img]则[img=170x38]1786a060264e037.png[/img]( )。 A: 2 B: 10 C: 26 D: 4
- 设曲线y=y(x)满足xdy+(x-2y)dx=0,且y=y(x)与直线x=1及x轴所围成的平面图形绕x轴旋转的旋转体积最小,则y(x)= A: [img=61x43]1802fb22da22c02.png[/img] B: [img=61x43]1802fb22e260f78.png[/img] C: [img=55x43]1802fb22eb6f8a2.png[/img] D: [img=55x43]1802fb22f43897e.png[/img]