设随机变量X的密度函数为[img=210x61]18036b04aeab942.png[/img]则A=_____________.

“x的取值在&#91;1,10&#93;或&#91;200,210&#93;范围内为真”的表达式是() A: (x>=1)&&(x<=10)&&(x>=200)&&(x<=210) B: (x>=1)&&(x<=10)||(x>=200)&&(x<=210) C: (x>=1)||(x<=10)||(x>=200)||(x<=210) D: (x>=1)&&(x<=10)||(x>=200)||(x<=210)

能正确表示“当x的取值在&#91;1,10&#93;和&#91;200,210&#93;范围内为真,否则为 A: 的表达式是() B: (x>=1)&&(x<=10)&&(x>=200)&&(x<=210) C: (x>=1)||(x<=10)||(x>=200)||(x<=210) D: (x>=1)&&(x<=10)||(x>=200)&&(x<=210) E: (x>=1)||(x<=10)&&(x>=200)||(x<=210)

常用钢丝绳一般为6 X 19、6 X 37、6 X 61三种。（)

独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da13460ecf5.png[/img][img=36x43]1803da134eadb99.png[/img][img=57x43]1803da135709664.png[/img]…[img=58x43]1803da135e5a076.png[/img]… D: X123…k…P[img=9x43]1803da13671cd55.png[/img][img=36x43]1803da13703c21c.png[/img][img=57x43]1803da1378489ec.png[/img]…[img=58x43]1803da13822269c.png[/img]…

独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803573572a7b80.png[/img][img=36x43]180357357af3976.png[/img][img=57x43]180357358399321.png[/img]…[img=58x43]180357358bf0f84.png[/img]… D: X123…k…P[img=9x43]180357359488348.png[/img][img=36x43]180357359c7d68a.png[/img][img=57x43]18035735a57969a.png[/img]…[img=58x43]18035735ae0e3f4.png[/img]…

独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da175d21bb3.png[/img][img=36x43]1803da176510759.png[/img][img=57x43]1803da176e34ee6.png[/img]…[img=58x43]1803da177747ce7.png[/img]… D: X123…k…P[img=9x43]1803da177fbaa74.png[/img][img=36x43]1803da17890c39f.png[/img][img=57x43]1803da1792a9c56.png[/img]…[img=58x43]1803da179bd7a28.png[/img]…

210、函数y=(x+3)²-1（x＜-3）的反函数

两浮点数 x=0.1101 ´210 , y=(0.1011) ´201, 求x+y。

A4纸的图幅大小为（ ） A: 215X297 B: 210 X 297 C: 520 X 280 D: 321 X 324