微分方程y"＋2y&39;＋3y=0的通解为（）

A . 1+x2=cyB . （1+x2）（3+2y）=cC .https://assets.asklib.com/psource/2015110316014925465.png D . （1+x2）2（3+2y）=c

A . y=C +C x+C e +C e B . y=C cosx+C sinx+C x+C C . y=C +C X+C e +C e D . y=C e +C e +C cosx+C sinx

A .https://assets.asklib.com/images/image2/2017051115262332611.png B .https://assets.asklib.com/images/image2/201705111526331392.png C .https://assets.asklib.com/images/image2/2017051115263940123.png D .https://assets.asklib.com/images/image2/2017051115264827726.png

A . y=C e +C e B . y=e （C +C x） C . y=C e +C e D . y=C e +C e

A .https://assets.asklib.com/psource/2015102915342612748.jpg B .https://assets.asklib.com/psource/2015102915344191283.jpg C .https://assets.asklib.com/psource/2015102915345561485.jpg D .https://assets.asklib.com/psource/2015102915350977296.jpg

设方程y"-2y&39;-3y=f(x)有特解y^*，则它的通解是______；

A．y=e^x+e^-x B．y=e^x-e^-x C．y=C₁e^x+C₂e^-x D．y=C₁e^2x+C₂e^-2x

A.sinx+C1x+C2 B.sinx+C1+C2 C.-sinx+C1x+C2 D.-sinx+C1+C2

A．y=e^C₁x B．y=C₁x+C₂ C．y=C₂e^C₁x D．y=e^C₁x+C₂

微分方程y&quot;+4y&amp;39;+4y=0的通解为() <img src='https://img2.soutiyun.com/ask/uploadfile/9819001-9822000/0114f033e5fd1ce4fe144720818b3399.png' />

求方程y&quot;+2y&39;-3y=e^x的特解．

验证函数y₁=e^4x与y₂=e^-x是方程y&quot;-3y&39;-4y=0的两个解，并写出该方程的通解．

求微分方程y&quot;-4y=e^x2的通解。

<img src='https://img2.soutiyun.com/ask/2020-12-21/97739374001756.png' />

A.<img src='https://img2.soutiyun.com/ask/2020-12-11/976570627255246.png' /> B.<img src='https://img2.soutiyun.com/ask/2020-12-11/976570636978802.png' /> C.<img src='https://img2.soutiyun.com/ask/2020-12-11/976570649953544.png' /> D.<img src='https://img2.soutiyun.com/ask/2020-12-11/976570665915458.png' />