计算积分[img=103x38]17e440fe2e2bae8.jpg[/img],其中C为正向圆周[img=65x19]17e440fe375fc47.jpg[/img]
未知类型:{'options': ['0', ' [img=13x14]17e43c5fcfe80eb.jpg[/img]', ' [img=17x33]17e440fe40a44dc.jpg[/img]', ' [img=17x34]17e440fe4afcda3.jpg[/img]'], 'type': 102}
未知类型:{'options': ['0', ' [img=13x14]17e43c5fcfe80eb.jpg[/img]', ' [img=17x33]17e440fe40a44dc.jpg[/img]', ' [img=17x34]17e440fe4afcda3.jpg[/img]'], 'type': 102}
举一反三
- 已知随机变量X的分布列如下:[img=386x130]17e43ec4c459e73.png[/img],则E(X)= A: 17/30 B: m未知,无法求出 C: -30/17 D: -17/30
- 求不定积分[img=132x48]17da6537fc8dad6.png[/img]; ( ) A: -(4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) B: (4*(sin(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) C: (4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) D: (4*(cos(x/2)/2 + 2*cos(x/2)))/(17*exp(2*x))
- 计算积分[img=93x39]17e440fd83fe1c3.jpg[/img],其中C为正向圆周[img=65x19]17e440fd8d4bdc4.jpg[/img] 未知类型:{'options': ['0', ' [img=13x14]17e43c5fcfe80eb.jpg[/img]', ' [img=31x16]17e43cd7c073b99.jpg[/img]', ' [img=21x15]17e43c5fc7b516b.jpg[/img]'], 'type': 102}
- 求微分方程[img=143x21]17da5f14490e50e.png[/img]的通解,实验命令为(). A: dsolve(D2y-2*Dy+5*y=sin(2*x),x)ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x) B: dsolve('D2y-2*Dy+5*y=sin(2*x)','x')ans =cos(2*x)*(sin(4*x)/17 - cos(4*x)/68 + 1/4) - sin(2*x)*(cos(4*x)/17 + sin(4*x)/68) + C1*cos(2*x)*exp(x) - C2*sin(2*x)*exp(x) C: dsolve(D2y-2*Dy+5*y=sin(2*x),'x','y')ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x)
- 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}