图示电路时间常数τ为（ ）[img=223x148]1803b3d2b3af0ae.png[/img]
A: [img=51x40]1803b3d2bc1f90e.png[/img]
B: [img=99x47]1803b3d2c445814.png[/img]
C: [img=106x86]1803b3d2cd7f381.png[/img]
D: [img=36x37]1803b3d2d5d821d.png[/img]
A: [img=51x40]1803b3d2bc1f90e.png[/img]
B: [img=99x47]1803b3d2c445814.png[/img]
C: [img=106x86]1803b3d2cd7f381.png[/img]
D: [img=36x37]1803b3d2d5d821d.png[/img]
举一反三
- 求函数[img=102x46]17da6537bc771a0.png[/img]的导数； ( ) A: -x/(a^2 - x^2)^(3/2) B: x/(a^2 - x^2)^(3/2) C: (a^2 - x^2)^(3/2)/x D: (a^2 - x^2)^(1/2)
- 已知[img=52x29]18038be96ed0534.png[/img]，[img=115x51]18038be97866e95.png[/img]，在MATLAB中若想由x生成矩阵A可调用命令 A: A=[x,x.^2,x.^3] B: A=[x,x^2,x^3] C: A=[x;x.^2;x.^3] D: A=[x;x^2;x^3]
- 已知[img=52x29]1802e9891f49f72.png[/img]，[img=115x51]1802e989277fcbc.png[/img]，在MATLAB中若想由x生成矩阵A可调用命令 A: A=[x,x.^2,x.^3] B: A=[x,x^2,x^3] C: A=[x;x.^2;x.^3] D: A=[x;x^2;x^3]
- 已知[img=52x29]1803bbd8531a1be.png[/img]，[img=115x51]1803bbd85b65619.png[/img]，在MATLAB中若想由x生成矩阵A可调用命令 A: A=[x,x.^2,x.^3] B: A=[x,x^2,x^3] C: A=[x;x.^2;x.^3] D: A=[x;x^2;x^3]
- 17da426f4cb2265.jpg,计算[img=23x22]17da426f58ddf0c.jpg[/img]实验命令为( ). A: f=diff(log(x),3)f=2/x^3 B: syms x; f=diff(log(x),3)f=2/x^3 C: syms x;f=diff(logx,3)f=2/x^3