X+Y+(X-Y)=1994005/997002+1997/997002 2X=1996002/997002,X=998001/997002,X+Y=1994005/997002 将X 代入公式,Y,1994005/997002-998001/1997002=996004/997002 化简为498002/498501
X+Y+(X-Y)=1994005/997002+1997/997002 2X=1996002/997002, X=998001/997002,X+Y=1994005/997002 将X 代入公式,Y,1994005/997002-998001/1997002=996004/997002 化简为498002/498501