一非线性电阻其伏安特性为 [img=130x27]180310825178b94.png[/img],设 [img=120x25]1803108259fab03.png[/img] ,则 [img=143x25]1803108263e79e6.png[/img]
举一反三
- 一非线性电阻其伏安特性为[img=130x27]180310829f4ed0f.png[/img],设[img=120x25]18031082a8790ac.png[/img] ,则[img=143x25]18031082b16dad2.png[/img]
- 一非线性电阻其伏安特性为 [img=130x27]180348d0b51c019.png[/img],设 [img=120x25]180348d0be843b0.png[/img] ,则 [img=143x25]180348d0c6b5e14.png[/img]
- 设随机变量 X ~ e([img=11x19]1803bbe33f2dc36.png[/img]),则 D(X )= [img=18x43]1803bbe34777894.png[/img].
- 设X为随机变量,若数学期望E(X)存在,则数学期望E(E(X))=__________。 A: E(X) B: 0 C: [img=51x27]18038f919d83a08.png[/img] D: [img=63x27]18038f91a6f0476.png[/img]
- 设投掷1颗骰子的点数为X,则( ) 未知类型:{'options': ['E(X)=3.5,D(X)= [img=29x21]17e43c3db9dc21b.png[/img]', ' E(X)=3.5, D(X)= [img=22x41]17e43c3dc2146ee.png[/img]', ' E(X)=3.5,D(X)=3.5', ' E(X)=3.5,D(X)=[img=22x41]17e43c3dcacf7d1.png[/img]'], 'type': 102}