曲线[img=69x22]1803e2809626197.png[/img]与[img=170x25]1803e2809e9ef3d.png[/img]所围成图形的面积为( )
A: [img=166x49]1803e280a922bb3.png[/img]
B: [img=166x49]1803e280b412f45.png[/img]
C: [img=182x49]1803e280bf49947.png[/img]
D: 无法计算
A: [img=166x49]1803e280a922bb3.png[/img]
B: [img=166x49]1803e280b412f45.png[/img]
C: [img=182x49]1803e280bf49947.png[/img]
D: 无法计算
举一反三
- 由曲线y = ln x与两直线y = e + 1 - x及y =0所围成的平面图形的面积是( ) A: [img=9x43]1803d359c6d03bb.png[/img] B: [img=9x43]1803d359cf002dd.png[/img] C: [img=9x43]1803d359d7c81af.png[/img] D: [img=9x43]1803d359e1364cf.png[/img]
- 由[img=35x25]1803d355c182eb9.png[/img]上连续曲线y = f(x)及直线x =a,x= b(a <b)与x轴所围图形面积S=( ) A: [img=83x52]1803d355cabd312.png[/img] B: [img=95x53]1803d355d361a34.png[/img] C: [img=91x52]1803d355dc59dde.png[/img] D: [img=149x45]1803d355e4a0041.png[/img]
- 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