函数[img=171x26]18031b3c1da7104.png[/img]的拐点是[img=35x25]18031b3c25cea69.png[/img]
A: [img=67x25]18031b3c2df5a5f.png[/img]
B: [img=39x25]18031b3c3768e9c.png[/img]
C: [img=39x25]18031b3c405a1c7.png[/img]
D: [img=39x25]18031b3c4a38e59.png[/img]
A: [img=67x25]18031b3c2df5a5f.png[/img]
B: [img=39x25]18031b3c3768e9c.png[/img]
C: [img=39x25]18031b3c405a1c7.png[/img]
D: [img=39x25]18031b3c4a38e59.png[/img]
举一反三
- 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
- 设随机变量X和Y的概率密度分别为：[img=474x78]1802e8d4b06a97d.png[/img]且X和Y相互独立，则2X-3Y的方差为( )． A: 25/16 B: 5/4 C: 25/9 D: 5/3
- 求不定积分[img=115x46]17da65382f8e1b9.png[/img]； （ ） A: x - (5*log(x + 1))/4 - (3*log(x - 3)) B: (5*log(x + 1))/4 - (3*log(x - 3)) C: x - (5*log(x + 1))/4 - (3*log(x - 3))/4 D: (5*log(x + 1))/4 - (3*log(x - 3))/4
- 函数f(x）=[img=36x34]17da597818eff33.jpg[/img]的定义域是 A: {x|x≠-3} B: {x|x;-3} C: R
- 随机变量 X 服从均匀分布[img=296x96]17de89393460b92.png[/img]则D(X)=( ). A: 4.5 B: 25/12 C: 1/5 D: 1