举一反三
- The function [img=114x27]1803e256894224d.png[/img] is a periodic function.
- The function [img=164x43]1803e256fccc749.png[/img] is a （ ）. A: bounded function B: periodic function C: even function D: odd function
- If [img=34x25]1803e254fa72e37.png[/img] is an even function and [img=33x25]1803e25502f5f78.png[/img] is an odd function，then ( ). A: All [img=191x25]1803e2550bd75da.png[/img] are even functions; B: All [img=191x25]1803e25513d5400.png[/img] are odd functions; C: [img=124x25]1803e2551c3ff9f.png[/img]are odd functions and [img=56x25]1803e25523e8c1c.png[/img]is an even function; D: [img=124x25]1803e2552c8c3c6.png[/img] are even functions and [img=56x25]1803e25534c2a44.png[/img] is an odd function.
- As [img=71x19]1803e23556504c2.png[/img], the function [img=104x25]1803e2356097b36.png[/img] is（ ）. A: an infinity B: an infinitesimal C: an unbounded function D: a bounded function
- If X and Y are any two independent continuous random variables whose probability density is [img=41x25]1803dc1d154ea64.png[/img] and [img=38x26]1803dc1d1dd7772.png[/img],and whose distribution function is [img=47x25]1803dc1d26f6f50.png[/img] and [img=42x25]1803dc1d300d282.png[/img],then [img=47x25]1803dc1d26f6f50.png[/img] + [img=42x25]1803dc1d300d282.png[/img] must be the distribution function of a random variable.
内容
- 0
The function [img=170x29]1803e256de424b0.png[/img] is a composition function of [img=115x28]1803e256e701aae.png[/img] and [img=83x24]1803e256ef4fec1.png[/img].
- 1
The function [img=118x45]1803e256879b359.png[/img] is an even function, where [img=43x19]1803e2568fe9357.png[/img] and [img=43x23]1803e25698e34e9.png[/img].
- 2
在环形区域[img=136x26]18030733be53638.png[/img]上， 绘制函数图形[img=129x27]18030733c6c9cd6.png[/img] A: Plot3D[x^2+y^2,{x,-2,2},{y,-2,2},Exclusions→Function[{x,y},0.5<x^2+y^2<2]] B: Plot3D[x^2+y^2,{x,-2,2},{y,-2,2},RegionFunction→Function[{x,y},0.5<x^2+y^2<2]] C: Plot3D[x^2+y^2,{x,-2,2},{y,-2,2},RegionFunction→Function[{x,y},2>x^2+y^2>0.5]] D: Plot3D[x^2+y^2,{y,-2,2},{x,-2,2},Exclusions→Function[{x,y},0.5<x^2+y^2<2]]
- 3
If the function [img=34x25]17de81deae56b45.png[/img] is a monotonically increasing continuous function, then [img=201x51]17de81deba1b3ad.png[/img].
- 4
Known a scalar function [img=108x26]1803b72075a8d3c.png[/img], vector [img=136x30]1803b7207e4da5d.png[/img] , then the directional derivative of the scalar function [img=11x14]1803b720860ea18.png[/img] at point (2,-1,1) along vector [img=6x19]1803b7208dcaa57.png[/img] is ( ) A: 1 B: -1 C: [img=9x43]1803b72094edd3a.png[/img] D: [img=25x43]1803b7209ca0410.png[/img]