I really kie the actor Jackie Chen.He is funny and he is also a very s( ) actor in the world.填空

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• I really kie the actor Jackie Chen.He is funny and he is also a very s( ) actor in the world.填空
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• 利用Matlab的dsolve命令解微分方程答案为什么不对?我想求解y''+4y'+3=0这个方程,我利用这个命令dsolve('D2y+4*Dy+3=0','y(0)=5','Dy(0)=-7'),25/(16*exp(4*t)) - (3*t)/4 + 55/16 ,但很明显这方程的解是 exp(-3*t)+4*exp(-t) ,究竟为什么答案不对的,