设多项分布随机向量(n11,n12,n21,n22)～M(40,0.1,0.4,0.2,0.3)，则随机变量n11～；随机变量n11+n12～。 A: N(4,3.6);N(20,10) B: B(40,0.1); B(40,0.5) C: M(40,0.1); M(40,0.1,0.4) D: P(4); P(16)

公告：维护QQ群：833371870，欢迎加入！
公告：维护QQ群：833371870，欢迎加入！
公告：维护QQ群：833371870，欢迎加入！

2022-07-23 问题

设多项分布随机向量(n11,n12,n21,n22)～M(40,0.1,0.4,0.2,0.3)，则随机变量n11～；随机变量n11+n12～。 A: N(4,3.6);N(20,10) B: B(40,0.1); B(40,0.5) C: M(40,0.1); M(40,0.1,0.4) D: P(4); P(16)

2022-06-07 问题

计算N阶行列式：11...1(-n)11...(-n)1............1(-n)..11(-n)1...11

2021-04-14 问题

求满足如下条件的三位数。它除以 11 所得的商等于各位数字的平方和。例如： 550/11=50=5 × 5+5 × 5+0 。完善下列程序。 Private Sub Form_Click() Dim a As Integer, b As Integer, c As Integer, n As Integer, j As Integer For a=_____ For b=0 To 9 For c=0 To 9 N=_ If (n mod 11=0) and (n\11=aa+bb+cc) then Print n; "/11=";n/11; "=";aa; bb; cc End if Next c _________ Next a End Sub

求满足如下条件的三位数。它除以 11 所得的商等于各位数字的平方和。例如： 550/11=50=5 × 5+5 × 5+0 。完善下列程序。 Private Sub Form_Click() Dim a As Integer, b As Integer, c As Integer, n As Integer, j As Integer For a=___________ For b=0 To 9 For c=0 To 9 N=_____________ If (n mod 11=0) and (n\11=a*a+b*b+c*c) then Print n; "/11=";n/11; "=";a*a; b*b; c*c End if Next c _______________ Next a End Sub

2022-06-30 问题

请问如下算法运行完之后n，n1，n2分别是多少？ var n1=10, n2=20; n = n1++; n = ++n1; n = n2--; n = --n2; A: n=18, n1=12, n2=18 B: n=11, n1=11, n2=19 C: n=12, n1=12, n2=18 D: n=19, n1=11, n2=19

请问如下算法运行完之后n，n1，n2分别是多少？ var n1=10, n2=20; n = n1++; n = ++n1; n = n2--; n = --n2; A: n=18, n1=12, n2=18 B: n=11, n1=11, n2=19 C: n=12, n1=12, n2=18 D: n=19, n1=11, n2=19

2022-10-29 问题