1803c1df74d57b6.png是抛物面[img=97x26]1803c1df7d45549.png[/img]位于[img=42x21]1803c1df84d83e6.png[/img]部分， 则第一类曲面积分[img=68x48]1803c1df8cf35ad.png[/img]等于
A: [img=87x48]1803c1df9569bf7.png[/img]
B: [img=87x48]1803c1df9e05731.png[/img]
C: [img=56x48]1803c1dfa653296.png[/img]
D: [img=87x48]1803c1dfaf150b3.png[/img]
E: [img=87x48]1803c1dfb6dc694.png[/img]
F: [img=47x48]1803c1dfbe98555.png[/img]
A: [img=87x48]1803c1df9569bf7.png[/img]
B: [img=87x48]1803c1df9e05731.png[/img]
C: [img=56x48]1803c1dfa653296.png[/img]
D: [img=87x48]1803c1dfaf150b3.png[/img]
E: [img=87x48]1803c1dfb6dc694.png[/img]
F: [img=47x48]1803c1dfbe98555.png[/img]
举一反三
- 1803229d803dc2d.png是抛物面[img=97x26]1803229d8863279.png[/img]位于[img=42x21]1803229d907029c.png[/img]部分， 则第一类曲面积分[img=68x48]1803229d989cf07.png[/img]等于 A: [img=87x48]1803229da0a2dfd.png[/img] B: [img=87x48]1803229da8ff210.png[/img] C: [img=56x48]1803229db1547cd.png[/img] D: [img=87x48]1803229db95c7a8.png[/img] E: [img=87x48]1803229dc19a2b6.png[/img] F: [img=47x48]1803229dc9a521f.png[/img]
- 要求方程[img=69x27]1802e4da216c9dd.png[/img]的解，应使用命令 A: dsolve('Df=x^2') B: dsolve('Df==x^2') C: dsolve('Df=x^2',x) D: dsolve('Df==x^2',x)
- 1.设随机变量X的密度为[img=186x61]18034ea953ec9dd.png[/img]则常数A=________，概率[img=146x25]18034ea95d30d08.png[/img]__________. A: A=2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] B: A=-2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] C: A=2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img] D: A=-2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img]
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]18036de4b8088be.png[/img] B: [img=75x24]18036de4bf77b71.png[/img] C: [img=75x24]18036de4c8172a3.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]1803645ffb36da1.png[/img] B: [img=75x24]180364600306be0.png[/img] C: [img=75x24]180364600c8ab8b.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)