等差数列中[img=96x18]17da5ffcacb4c03.jpg[/img],求[img=48x19]17da5ffcb5b02db.jpg[/img]
A: 345
B: 335
C: 240
D: 165
A: 345
B: 335
C: 240
D: 165
举一反三
- 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
- 已知单线激光雷达数据点(ρ, θ)=(10,30°),计算x、y: A: [img=118x28]18036c00fcf56fb.png[/img] B: [img=118x28]18036c010630126.png[/img] C: x= 5, y=5 D: x=10, y=5
- 设[img=84x22]17e0ab7201ab5da.jpg[/img],且P{2<;X<;4}=0.1,不查表计算P{X<;0}=( ) A: 1/5 B: 2/5 C: 3/5 D: 4/5
- 设[img=84x22]17e43a3ff587368.jpg[/img],且P{2<;X<;4}=0.1,不查表计算P{X<;0}=( ) A: 1/5 B: 2/5 C: 3/5 D: 4/5
- 设f(x)为连续函数,且 [img=217x49]18034a50d8b1b92.png[/img] 则[img=70x25]18034a50e196c62.png[/img] A: 5 B: 4 C: 0 D: -5