以y1=ex,y2=e-3x为特解的线性常系数齐次微分方程是( )。A.y''-...

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【单选题】

以y1=ex,y2=e-3x为特解的线性常系数齐次微分方程是( )。

y''-2y'-3y=0

y''+2y'-3y=0

y''-3y'+2y=0

y''+3y'-2y=0

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