问题
填空题
已知x2+y2-2x+10y+26=0,则x+y=______,xy=______,x2+y2=______.
答案
∵x2+y2-2x+10y+26=(x-1)2+(y+5)2=0,
∴x-1=0,y+5=0,即x=1,y=-5,
则x+y=1-5=-4;xy=-5;x2+y2=1+25=26.
故答案为:-4;-5;26.
已知x2+y2-2x+10y+26=0,则x+y=______,xy=______,x2+y2=______.
∵x2+y2-2x+10y+26=(x-1)2+(y+5)2=0,
∴x-1=0,y+5=0,即x=1,y=-5,
则x+y=1-5=-4;xy=-5;x2+y2=1+25=26.
故答案为:-4;-5;26.