已知x(n)={1,2,3},y(n)={4,-5,6},则x(n)④y(n)=()
A: {4,3,8,-3,18}
B: {4,3,8,-3}
C: {22,3,8,-3}
D: {…,22,3,8,-3,…} ↑
A: {4,3,8,-3,18}
B: {4,3,8,-3}
C: {22,3,8,-3}
D: {…,22,3,8,-3,…} ↑
举一反三
- 已知x(n)={1,2,3},y(n)={4,-5,6},则x(n)④y(n)=() A: {4,3,8,-3,18} B: {4,3,8,-3} C: {22,3,8,-3} D: {…,22,3,8,-3,…} ↑
- 已知x(n)={1, 2, 3},y(n)={1, 2, 1},则x(n)*y(n)=________。(下划线表示n=0) A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}
- 应用Matlab软件计算行列式[img=110x88]17da5d7b00219d6.png[/img]为( ). A: x^2 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 B: x^3 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 C: x^4 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 D: x^5- 6*x^2*y^2 + 8*x*y^3 - 3*y^4
- 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(3, 12),Y ~ N(2, 4),且 X,Y 独立,则 X − Y ~ N(1, 8) .