过点[img=83x25]18038d7dab6c0f9.png[/img]且与[img=33x23]18038d7db43568a.png[/img]坐标面垂直的直线上点的坐标[img=56x25]18038d7dbbf4699.png[/img]满足（ ）.
A: [img=56x20]18038d7dc3febf9.png[/img]且[img=32x22]18038d7dcd35346.png[/img]
B: [img=56x20]18038d7dc3febf9.png[/img]
C: [img=32x22]18038d7dcd35346.png[/img]
D: [img=56x20]18038d7dc3febf9.png[/img]或[img=32x22]18038d7dcd35346.png[/img]
A: [img=56x20]18038d7dc3febf9.png[/img]且[img=32x22]18038d7dcd35346.png[/img]
B: [img=56x20]18038d7dc3febf9.png[/img]
C: [img=32x22]18038d7dcd35346.png[/img]
D: [img=56x20]18038d7dc3febf9.png[/img]或[img=32x22]18038d7dcd35346.png[/img]
举一反三
- 过点[img=83x25]18039c9acc4265e.png[/img]且与[img=33x23]18039c9ad4f2c1e.png[/img]坐标面垂直的直线上点的坐标[img=56x25]18039c9ade1e6e2.png[/img]满足（ ）. A: [img=56x20]18039c9ae634d1b.png[/img]且[img=32x22]18039c9aef039eb.png[/img] B: [img=56x20]18039c9ae634d1b.png[/img] C: [img=32x22]18039c9aef039eb.png[/img] D: [img=56x20]18039c9ae634d1b.png[/img]或[img=32x22]18039c9aef039eb.png[/img]
- 过点[img=83x25]1802cfce8a2968e.png[/img]且与[img=33x23]1802cfce9319b33.png[/img]坐标面垂直的直线上点的坐标[img=56x25]1802cfce9af4ceb.png[/img]满足（ ）. A: [img=56x20]1802cfcea35ab77.png[/img]且[img=32x22]1802cfceacef7f1.png[/img] B: [img=56x20]1802cfcea35ab77.png[/img] C: [img=32x22]1802cfceacef7f1.png[/img] D: [img=56x20]1802cfcea35ab77.png[/img]或[img=32x22]1802cfceacef7f1.png[/img]
- 设X，Y为两个随机变量，且[img=179x25]1803395d555effc.png[/img] , [img=226x25]1803395d61f1a43.png[/img] ,则[img=143x25]1803395d6f00057.png[/img]= ( )． A: 1/7 B: 3/7 C: 4/7 D: 5/7
- X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803da40b5dbfd6.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32
- X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803da40ac7a8ce.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32