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特徵方程為4r^2-12r+9=0,r=3/2 所以y=e^(3x/2)(C1x+C2) y'=e^(3x/2)(3C1/2*x+3C2/2+C1) 令x=0: 1=C2,1=3C2/2+C1 解得C1=-1/2,C2=1 所以y=e^(3x/2)(-x/2+1)
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