是x+y=8吧?
那么由①得：x=8-y……③
代人②得：8-y-y-(8-y)²+2(8-y)y-y²+2=0
8-y-y-64+16y-y²+16-2y-y²+2=0
y²-6y+19=0
∵△=36-76<0
∴方程组无解 是x+y=8吧?
那么由①得：x=8-y……③
代人②得：8-y-y-(8-y)²+2(8-y)y-y²+2=0
8-y-y-64+16y-y²+16-2y-y²+2=0
y²-6y+19=0
∵△=36-76<0
∴方程组无解