计算级数[img=130x60]1802ed4ae9f8604.png[/img]的收敛区间为( )
A: [img=52x25]1802ed4af13e96c.png[/img]
B: [img=49x25]1802ed4afbe2dd1.png[/img]
C: [img=59x43]1802ed4b038956f.png[/img]
D: [img=58x43]1802ed4b0b84718.png[/img]
A: [img=52x25]1802ed4af13e96c.png[/img]
B: [img=49x25]1802ed4afbe2dd1.png[/img]
C: [img=59x43]1802ed4b038956f.png[/img]
D: [img=58x43]1802ed4b0b84718.png[/img]
举一反三
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ，则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]
- 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的概率密度为[img=172x58]1802fe3273041d3.png[/img]则使得F{X > a} = F{X < a}成立，则a为( ). A: 2-1/4 B: 21/4 C: 1/2 D: 1-2-1/4
- 计算级数[img=89x60]1802ed4ad849fc9.png[/img]的收敛区间为( ) A: [img=52x25]1802ed4ae02e4ed.png[/img] B: [img=49x25]1802ed4ae916bc5.png[/img] C: [img=59x43]1802ed4af0cd77f.png[/img] D: [img=58x43]1802ed4af8c5dee.png[/img]
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2c47707b95.png[/img] B: [img=86x65]1802f2c47feb07a.png[/img] C: [img=75x58]1802f2c4884644b.png[/img] D: [img=87x58]1802f2c48fffbbf.png[/img]