分式线性变换[img=78x44]18036d4dcb99eea.png[/img]把圆周[img=42x25]18036d4dd3c8550.png[/img]映射为( ).
A: [img=46x25]18036d4ddc41cbd.png[/img]
B: [img=46x25]18036d4de444681.png[/img]
C: [img=77x25]18036d4ded3a70a.png[/img]
D: [img=77x25]18036d4df5cc783.png[/img]
A: [img=46x25]18036d4ddc41cbd.png[/img]
B: [img=46x25]18036d4de444681.png[/img]
C: [img=77x25]18036d4ded3a70a.png[/img]
D: [img=77x25]18036d4df5cc783.png[/img]
举一反三
- 求不定积分[img=121x54]17da653839aa6ae.png[/img]; ( ) A: log(x^2 + 3*x + 25/4)/4 + (5*atan(x/2 + 3/4))/4 B: log(x^2 + 3*x + 25/4)/4 C: (5*atan(x/2 + 3/4))/4 D: log(x^2 + 3*x + 25/4)/4 - (5*atan(x/2 + 3/4))/4
- 分式线性变换[img=78x44]1803026acb0ee11.png[/img]把圆周[img=42x25]1803026ad36ab51.png[/img]映射为( ). A: [img=46x25]1803026adb2bb29.png[/img] B: [img=46x25]1803026ae3e9019.png[/img] C: [img=77x25]1803026aec01c6b.png[/img] D: [img=77x25]1803026af496440.png[/img]
- 设随机变量X和Y的概率密度分别为:[img=474x78]1802e8d4b06a97d.png[/img]且X和Y相互独立,则2X-3Y的方差为( ). A: 25/16 B: 5/4 C: 25/9 D: 5/3
- 求不定积分[img=115x46]17da65382f8e1b9.png[/img]; ( ) A: x - (5*log(x + 1))/4 - (3*log(x - 3)) B: (5*log(x + 1))/4 - (3*log(x - 3)) C: x - (5*log(x + 1))/4 - (3*log(x - 3))/4 D: (5*log(x + 1))/4 - (3*log(x - 3))/4
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ,则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]