要去除积分[img=141x47]1803a4ae9b04471.png[/img]的根号可采取的变量代换为( )
A: [img=219x39]1803a4aea613092.png[/img].
B: [img=211x39]1803a4aeb13e3a2.png[/img].
C: [img=235x39]1803a4aebba5279.png[/img].
D: [img=235x39]1803a4aec65265a.png[/img].
A: [img=219x39]1803a4aea613092.png[/img].
B: [img=211x39]1803a4aeb13e3a2.png[/img].
C: [img=235x39]1803a4aebba5279.png[/img].
D: [img=235x39]1803a4aec65265a.png[/img].
举一反三
- 要去除积分[img=135x48]1803a4aeb0bcbe6.png[/img]中的根号可采取的变量代换为( ) A: [img=235x39]1803a4aebb9bf64.png[/img] B: [img=235x39]1803a4aec5bf271.png[/img] C: [img=251x39]1803a4aed0378c7.png[/img] D: [img=241x39]1803a4aeda360fc.png[/img]
- 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]
- 设[img=77x19]1802e2aa5a4095f.jpg[/img],则E(X)=4,D(X)=4/3.
- 设[img=127x53]17f1b3d6db98b83.jpg[/img],f(x)=arctanΧ,则[img=56x55]17f1b3d82842941.jpg[/img]=()。 A: π B: 3π/4 C: -3π/4 D: 2π
- 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