• 2022-07-29 问题

    N=3x&#91;sup&#93;3&#91;/&#93;-2y&#91;sup&#93;4&#91;/&#93;其绝对误差为() A: △N=9x<sup>2</sup>△x-8y<sup>3</sup>△y B: △N=3△x+2△y C: △N=9x<sup>2</sup>△x+8y<sup>3</sup>△y D: △N=9△x-8△y

    N=3x&#91;sup&#93;3&#91;/&#93;-2y&#91;sup&#93;4&#91;/&#93;其绝对误差为() A: △N=9x<sup>2</sup>△x-8y<sup>3</sup>△y B: △N=3△x+2△y C: △N=9x<sup>2</sup>△x+8y<sup>3</sup>△y D: △N=9△x-8△y

  • 2021-04-14 问题

    设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1).

    设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1).

  • 2022-07-26 问题

    下列哪条语句是正确的( ) A: A=[1 2;3 4];B=[3;7];A.*B; B: A=cell(2,3);A(1,2)=[4;5]; C: A=[2 3 5 7;9 4 6 1;7 3 2 5];B=[1 7;0 5];A(2:end,2:2:end) D: x=-5:5;y=-5:5;z=x.*x-y.*y;surf(x,y,z);

    下列哪条语句是正确的( ) A: A=[1 2;3 4];B=[3;7];A.*B; B: A=cell(2,3);A(1,2)=[4;5]; C: A=[2 3 5 7;9 4 6 1;7 3 2 5];B=[1 7;0 5];A(2:end,2:2:end) D: x=-5:5;y=-5:5;z=x.*x-y.*y;surf(x,y,z);

  • 2022-06-17 问题

    设X~N(1, 2), Y~N(-1, 3),且X与Y相互独立,则2X-Y~( ) A: N(3, 8) B: N(3, 5) C: N(3, 11) D: N(3,25)

    设X~N(1, 2), Y~N(-1, 3),且X与Y相互独立,则2X-Y~( ) A: N(3, 8) B: N(3, 5) C: N(3, 11) D: N(3,25)

  • 2022-05-31 问题

    下列数组声明语句中,不正确的是_________。 A: Dim a(9) As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} B: Dim a() = {1, 2, 3, 4, 5, 6, 10} C: Dim a( ,) As Single = {{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}} D: Dim a() As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} E: Dim n As Integer=10Dim a(n) As Single

    下列数组声明语句中,不正确的是_________。 A: Dim a(9) As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} B: Dim a() = {1, 2, 3, 4, 5, 6, 10} C: Dim a( ,) As Single = {{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}} D: Dim a() As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} E: Dim n As Integer=10Dim a(n) As Single

  • 2022-06-16 问题

    解差分方程y(n)-7y(n-1)+16y(n-2)-12y(n-3)=0y(1)=-1,y(2)=-3,y(3)=-5

    解差分方程y(n)-7y(n-1)+16y(n-2)-12y(n-3)=0y(1)=-1,y(2)=-3,y(3)=-5

  • 2021-04-14 问题

    中国大学MOOC: 设X~N(2, 9)则Y= (X– 2 )/9 ~N(0,1).

    中国大学MOOC: 设X~N(2, 9)则Y= (X– 2 )/9 ~N(0,1).

  • 2022-07-01 问题

    中国大学MOOC: 设X~N(2, 9)则Y= (X– 2 )/9 ~N(0, 1).

    中国大学MOOC: 设X~N(2, 9)则Y= (X– 2 )/9 ~N(0, 1).

  • 2022-07-01 问题

    设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1). A: 正确 B: 错误

    设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1). A: 正确 B: 错误

  • 2021-04-14 问题

    假设x=4,y=2,m=5,n=4,w=12,t=9,则经过表达式(w=x 0  9

    假设x=4,y=2,m=5,n=4,w=12,t=9,则经过表达式(w=x 0  9

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