求过原点且与方向{4,5,-2}垂直的平面方程( )
A: [img=126x33]18039fac3c7ab6e.png[/img]
B: [img=132x36]18039fac44c2535.png[/img]
C: [img=132x36]18039fac4c20445.png[/img]
D: [img=134x32]18039fac5524039.png[/img]
A: [img=126x33]18039fac3c7ab6e.png[/img]
B: [img=132x36]18039fac44c2535.png[/img]
C: [img=132x36]18039fac4c20445.png[/img]
D: [img=134x32]18039fac5524039.png[/img]
A
举一反三
- 求图示三根绳子AB、AC、AD的拉力。[img=712x511]1802f400a538cc1.png[/img] A: FAC=900N, FAD=464N, FAB=693N B: FAC=646N, FAD=900N, FAB=693N C: FAC=646N, FAD=693N, FAB=900N D: FAC=693N, FAD=900N, FAB=464N
- 设随机变量[img=75x25]1802d5ab02ff46a.png[/img],且已知 E[(X - 1)(X + 2)] = 6,则[img=30x19]1802d5ab0aa816f.png[/img] A: 1 B: 2 C: 3 D: 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]
- 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
- 设X,Y为两个随机变量,且[img=179x25]1803395d555effc.png[/img] , [img=226x25]1803395d61f1a43.png[/img] ,则[img=143x25]1803395d6f00057.png[/img]= ( ). A: 1/7 B: 3/7 C: 4/7 D: 5/7
内容
- 0
设随机变量X服从泊松分布,且P(X=1)=P(X=2),则P(X=4)= A: [img=37x34]1803b691e9c5052.jpg[/img] B: [img=33x33]1803b691f1ca73b.jpg[/img] C: [img=33x33]1803b691f9c90eb.jpg[/img] D: [img=33x33]1803b69202c0299.jpg[/img]
- 1
求平行于x轴,且过点M(3, 1, 2)及N(0, 1, 0)的平面方程 A: [img=106x22]1803bbf23013bbb.png[/img] B: [img=104x22]1803bbf237844f1.png[/img] C: [img=73x22]1803bbf23f6ec40.png[/img] D: [img=73x22]1803bbf2477b00f.png[/img]
- 2
设X是随机变量,且[img=139x31]1802e2aa00edf66.jpg[/img],则D(X)=( ). A: 2 B: 4 C: 6 D: 8
- 3
设随机变量X服从分布[img=219x29]1803aabfb46c4a5.png[/img],求D(X). A: 1 B: 2 C: 3 D: 4
- 4
设随机变量X服从分布[img=219x29]1803194c83c0235.png[/img],求D(X). A: 1 B: 2 C: 3 D: 4