麻烦帮忙解一下这道题
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The aux. equation
p^2 +(1/2)p -1/2 =0
p= (-1 +√5 ) /4 or (-1 -√5 ) /4
let
yg=Ae^[(-1 +√5 ) /4] +Be^[(-1 -√5 ) /4]
yp = Ce^x
yp'=yp''= Ce^x
yp''+(1/2)yp' -(1/2)yp = e^x
Ce^x+(1/2)Ce^x -(1/2)Ce^x = e^x
Ce^x=e^x
=> C=1
特解=yp = e^x
y= yg+yp = Ae^[(-1 +√5 ) /4] +Be^[(-1 -√5 ) /4] + e^x
p^2 +(1/2)p -1/2 =0
p= (-1 +√5 ) /4 or (-1 -√5 ) /4
let
yg=Ae^[(-1 +√5 ) /4] +Be^[(-1 -√5 ) /4]
yp = Ce^x
yp'=yp''= Ce^x
yp''+(1/2)yp' -(1/2)yp = e^x
Ce^x+(1/2)Ce^x -(1/2)Ce^x = e^x
Ce^x=e^x
=> C=1
特解=yp = e^x
y= yg+yp = Ae^[(-1 +√5 ) /4] +Be^[(-1 -√5 ) /4] + e^x
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