设[img=13x19]1803c1e8c9fbd3f.png[/img]:[img=134x26]1803c1e8d261533.png[/img]， 则曲面积分[img=165x48]1803c1e8dca780a.png[/img]的值等于
A: [img=36x22]1803c1e8e4ad992.png[/img]
B: [img=36x22]1803c1e8ee96cad.png[/img]
C: [img=36x22]1803c1e8f681e35.png[/img]
D: [img=36x22]1803c1e8feb5707.png[/img]
E: [img=36x22]1803c1e907a3aab.png[/img]
F: [img=36x22]1803c1e9102d8a8.png[/img]
G: [img=45x22]1803c1e9197cd3f.png[/img]
H: [img=45x22]1803c1e92267f63.png[/img]
I: [img=45x22]1803c1e92ab0fd5.png[/img]
J: [img=45x22]1803c1e9339b085.png[/img]
A: [img=36x22]1803c1e8e4ad992.png[/img]
B: [img=36x22]1803c1e8ee96cad.png[/img]
C: [img=36x22]1803c1e8f681e35.png[/img]
D: [img=36x22]1803c1e8feb5707.png[/img]
E: [img=36x22]1803c1e907a3aab.png[/img]
F: [img=36x22]1803c1e9102d8a8.png[/img]
G: [img=45x22]1803c1e9197cd3f.png[/img]
H: [img=45x22]1803c1e92267f63.png[/img]
I: [img=45x22]1803c1e92ab0fd5.png[/img]
J: [img=45x22]1803c1e9339b085.png[/img]
举一反三
- 设[img=13x19]180385708141bd8.png[/img]:[img=134x26]180385708a4605c.png[/img]， 则曲面积分[img=165x48]180385709512222.png[/img]的值等于 A: [img=36x22]180385709cf5203.png[/img] B: [img=36x22]18038570a44dac4.png[/img] C: [img=36x22]18038570ad9625c.png[/img] D: [img=36x22]18038570b674be2.png[/img] E: [img=36x22]18038570bec2a4f.png[/img] F: [img=36x22]18038570c7d1784.png[/img] G: [img=45x22]18038570d076b82.png[/img] H: [img=45x22]18038570d932d01.png[/img] I: [img=45x22]18038570e10fc4f.png[/img] J: [img=45x22]18038570ea5aae3.png[/img]
- 已知X的分布律为P(X=-1）=1/4,P(X=0）=1/4,P(X=1）=3/8,P(X=3）=1/8,则E(2X+1）=（ ），E([img=42x20]17e0c5d65688ad3.jpg[/img]）=（ ）。
- 设[img=13x19]180322a624be0bf.png[/img]:[img=134x26]180322a62cda317.png[/img]则二重闭合曲面积分[img=151x48]180322a6373863e.png[/img]的值 A: [img=36x22]180322a64018e8e.png[/img] B: [img=36x22]180322a648a0fc9.png[/img] C: [img=36x22]180322a6506f62d.png[/img] D: [img=36x22]180322a659ccbef.png[/img] E: [img=36x22]180322a66245955.png[/img] F: [img=36x22]180322a66a9890b.png[/img] G: [img=45x22]180322a673f228d.png[/img] H: [img=45x22]180322a67bf4ea2.png[/img] I: [img=45x22]180322a68442570.png[/img] J: [img=45x22]180322a68c97c3d.png[/img]
- 设随机变量X服从均值为2的指数分布，X的分布函数为F(x)，数学期望为E(X)，方差为D(X)，则以下结果正确的是 A: [img=128x28]1802d3b369ab5fe.png[/img] B: D(X)=4 C: P(X<2︱X>1)=F(1) D: P(X>2︱X>1)= F(1) E: [img=112x27]1802d3b372fb534.png[/img] F: D(X)=E(X) G: P(X≤2︱X>1)= F(2) H: [img=82x27]1802d3b37bbbf05.png[/img]
- 设随机变量X服从均值为2的指数分布，X的分布函数为F(x)，数学期望为E(X)，方差为D(X)，则以下结果正确的是 A: [img=128x28]18034b986fbc78a.png[/img] B: D(X)=4 C: P(X<2︱X>1)=F(1) D: P(X>2︱X>1)= F(1) E: [img=112x27]18034b98781508a.png[/img] F: D(X)=E(X) G: P(X≤2︱X>1)= F(2) H: [img=82x27]18034b9880d080a.png[/img]