已知x、y是实数,且适合方程(x²+xy-12)²+(xy-2y-1)² =0,求x、y的
5个回答
∵(x2+xy-12)2+(xy-2y-1)2 =0
∴x2+xy-12=0 ,xy-2y-1=0
解两式联立的方程组得:x= 3 ,y=1
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