求图题11-2所示各电路中标有问号的电压的表示式。

<img src='https://img2.soutiyun.com/ask/5364001-5367000/141e918444705bf908f4558f3a17ec9f.jpg' />

图题6-14所示电路中电源u_s(t)系一脉冲电压,该电压于t=0时作用于电路,持续1ms,在持续期间脉冲幅度为30V,试求i(t). <img src='https://img2.soutiyun.com/ask/2020-10-15/971628373938237.jpg' />

<img src='https://img2.soutiyun.com/ask/2021-01-21/980097424994737.jpg' />

试写出图题10-1所示方波的傅里叶级数。(利用教材图10-1(a)所示方波的傅里叶级数表示式。) <img src='https://img2.soutiyun.com/ask/2020-09-01/967820103151964.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-24/967136357397162.png' /><img src='https://img2.soutiyun.com/ask/2020-08-24/967136393334217.png' /><img src='https://img2.soutiyun.com/ask/2020-08-24/96713640161069.png' /> <img src='https://img2.soutiyun.com/ask/2020-08-24/96713641297734.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-24/967128400342044.png' /><img src='https://img2.soutiyun.com/ask/2020-08-24/96712841566392.png' /><img src='https://img2.soutiyun.com/ask/2020-08-24/96712843540805.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-05/978704111515359.png' /><img src='https://img2.soutiyun.com/ask/2021-01-05/978704176869097.png' />

求图2-2-1所示各f(t)的拉普拉斯变换式。 <img src='https://img2.soutiyun.com/ask/2021-01-07/978883128289772.png' />

求图所示的含受控源电路中，R_L两端的电压U。 <img src='https://img2.soutiyun.com/ask/2020-03-09/952634038812525.jpg' />

<img src='https://img2.soutiyun.com/ask/2020-07-24/96445118331937.png' />

图题2.4.5所示为一增益线性调节运放电路，试推导该电路的电压增益A_P=v₀/(v_i1-v_i2)的表达式。 <img src='https://img2.soutiyun.com/ask/2020-11-16/974407760026192.png' />

求图题11-6所示电路中的i₁和i₂，已知u_s(t)=100cos(10³+t+30°)V。 <img src='https://img2.soutiyun.com/ask/2020-08-31/967729012341469.png' />

图题11-3所示电路中,已知<img src='https://img2.soutiyun.com/ask/2020-07-24/964450491997828.png' />,试求输出电压u(t)。 <img src='https://img2.soutiyun.com/ask/2020-07-24/964450470432595.png' />

试用支路电流法或节点电压法求图所示电路中的各支路电流，并求三个电源的输出功率和负载电阻R_L取用的功率。0.8Ω和0.4Ω分别为两个电压源的内阻。 <img src='https://img2.soutiyun.com/ask/uploadfile/5454001-5457000/c00a7468bb4531f00ce4909f4a47627d.png' />

试求图题12-6所示电路的冲激响应h(t)=u(t)，并求u(0₊)，如发生跃变，试解释之。 <img src='https://img2.soutiyun.com/ask/2020-09-01/967819384556862.png' />

<img src='https://img2.soutiyun.com/ask/2020-06-28/962211212901237.jpg' />

<img src='https://img2.soutiyun.com/ask/2021-01-09/979035234346423.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-03/978541348429745.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-11/9792273411951.png' />

在图题6.2.1(主教材图 6.2.2)所示的射极耦合差分式放大电路中，+Vcc= +10V, -VEE= -10 V, Io=1mA, ro=25 kΩ(电路中未画出)， Rc1=Rc2=l0kΩ, BJT 的β=200，VBE =0.7 V; (1)当Ui1 =Ui2=0时，求Ic. VE、VCE1和VCE2; (2)当<img src='https://img2.soutiyun.com/ask/2020-06-29/962272700560939.png' />时，求双端输出时的AUd和单端输出的Avd1、Avc1和KCMR1的值。 <img src='https://img2.soutiyun.com/ask/2020-06-29/962272646297835.jpg' />

求图4-32所示各网络的策动点阻抗函数,在s平面示出其零、极点分布.若激励电压为冲激函数δ(t),求其响应电流的波形. <img src='https://img2.soutiyun.com/ask/2020-12-01/975675198845285.png' />

设运放为理想器件，试求图题9.8.5所示电压比较器的门限电压，并画出它的传输特性(图中V2=9V)。 <img src='https://img2.soutiyun.com/ask/2020-07-01/962464417625871.jpg' />

<img src='https://img2.soutiyun.com/ask/2020-08-25/967193533812756.png' />

题7-2图所示各电路中开关S在t=0时动作，试求各电路在t=0，时刻的电压电流。已知题7-2图(d)中的<img src='https://img2.soutiyun.com/ask/2020-08-24/96707702037258.png' />。 <img src='https://img2.soutiyun.com/ask/2020-08-24/96707704860863.png' />