y0= 2+e^(3x) 是 y''+py'+qy =0solutiiony0= 2+e^(3x) y0' = 3e^(3x)y0'= 9e^(3x) y0''+py0'+qy0 =0(9+3p+q).e^(3x) + 2q =09+3p+q =0 and 2q=0p =-3 and q=0 y''-3y'= 0
