逻辑式[img=220x32]18038179e78afd2.png[/img]
A: [img=125x32]18038179f2085ab.png[/img]
B: [img=125x32]18038179fd9dff7.png[/img]
C: [img=127x32]1803817a07f9e88.png[/img]
D: [img=129x32]1803817a1307e0d.png[/img]
A: [img=125x32]18038179f2085ab.png[/img]
B: [img=125x32]18038179fd9dff7.png[/img]
C: [img=127x32]1803817a07f9e88.png[/img]
D: [img=129x32]1803817a1307e0d.png[/img]
举一反三
- X为随机变量，E(X)=-1,D(X)=3,则[img=105x27]17de66c4ef75d99.png[/img] 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]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
- X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803381b293bffb.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]17de66bf652c147.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32