求解一道二重积分题：∫∫e^(x/(x+y))dxdy,积分区域:y>-x+1且y

求解一道二重积分题：∫∫e^(x/(x+y))dxdy,积分区域:y>-x+1且y
求解一道二重积分题：∫∫e^(x/(x+y))dxdy,积分区域:y>-x+1且y

求解一道二重积分题：∫∫e^(x/(x+y))dxdy,积分区域:y>-x+1且y
做变换,令u=x+y,v=y,则1

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