[問題] 師大兩題工數

[jsdre (火麒麟小嫩嫩)]

1.  { e^(x+y)-y }dx + {xe^(x+y)+1}dy = 0

2.  2δu/δx-3δu/δy+2u=2x
  initial condition is u(x,y)=x^2 for the line 2y+x=0

δ是偏微符號


感激不盡了 >"<


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