改变[img=151x53]1803d3413dd22d5.png[/img]的积分顺序为( )
A: [img=114x53]1803d3414b50673.png[/img]
B: [img=163x53]1803d34155abee7.png[/img]
C: [img=163x53]1803d341607049b.png[/img]
D: [img=162x54]1803d3416af6e6f.png[/img]
A: [img=114x53]1803d3414b50673.png[/img]
B: [img=163x53]1803d34155abee7.png[/img]
C: [img=163x53]1803d341607049b.png[/img]
D: [img=162x54]1803d3416af6e6f.png[/img]
举一反三
- 设随机变量X,Y相互独立，且都服从[0,1]上的均匀分布，则Z=X+Y的密度函数为（ ）. A: [img=163x53]18034e6ae640f0f.png[/img] B: [img=163x53]18034e6af0b9553.png[/img] C: [img=188x75]18034e6afbb2eaf.png[/img] D: [img=188x75]18034e6b080d89c.png[/img]
- 设积分区域D是由直线y = x,y = 0,x =1围成，则[img=173x60]1803d360a797630.png[/img] A: [img=151x51]1803d360b1cdf24.png[/img] B: [img=151x51]1803d360bbfae34.png[/img] C: [img=151x51]1803d360c6457e5.png[/img] D: [img=151x53]1803d360d1e65df.png[/img]
- 改换二次积分[img=157x53]180342ee9f5ffe4.png[/img]的积分次序得 A: [img=163x57]180342eeaa8c33a.png[/img] B: [img=163x53]180342eeb6fc2e8.png[/img] C: [img=163x53]180342eec1e4c33.png[/img] D: [img=169x53]180342eecd71233.png[/img]
- X~N(1,1), 密度函数为[img=37x25]18038fe689205b5.png[/img], 分布函数为F(x), 则（ ） A: [img=198x25]18038fe690a03ee.png[/img] B: [img=101x25]18038fe69af96aa.png[/img] C: [img=67x25]18038fe6a3b8e5b.png[/img][img=118x25]18038fe6ab93d6f.png[/img] D: F(x)=F(-x)
- 令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型：{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}