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ÓÚÊÇ y''+2y'/t-y=0
ÓÚÊÇ ty'' + 2y' -yt=0
ÓÚÊÇ ty'' + y' + y' =yt
ÓÚÊÇ (ty')' + y' =yt
ÓÚÊÇ (ty' +y)' =yt
ÓÚÊÇ (ty)''=yt
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DSolve[y''[x] + 2 y'[x]/x - y[x]/d == 0, y[x], x]
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y[x] -> (e^(-Sqrt[(1/d)] x) C[1])/x + (e^(Sqrt[1/d] x) C[2])/(
  2 Sqrt[1/d] x)

c[1],c[2]ÊÇ»ý·Ö³£Êý¡£Â¥Ö÷¿ÉÒÔ×Ô¼ºÊÔÊÔ£¬ºÜ¼òµ¥µÄ¡£
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