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y=(Ax2+Bx)ex y=(Ax+ex y=Ax2ex y=Axex
y″+y′-2y=2+ex y″-y′-2y=4x+2ex y″-2y′+y=x+ex y″-2y′=4+2ex
(ax2+bx)ex (ax2+b)ex ax2ex (ax+b)ex
aex+b axex+bx aex+bx axex+b
aex+b axex+b aex+bx axex+bx
y*=x(Ax+B)e4x y*=xe4x y*=(Ax+B)e4x y*=Axe4x
(ax+b)ex. (ax+b)xex. (ax+b)+cex. (ax+b)+cxex.
y=(Ax2+Bx)ex y=(Ax+ex y=A2ex y=Axex