1.a^2b^2+a^2+b^2+1=4ab
a^2+b^2-2ab+a^2b^2+1-2ab=0
(a-b)^2+(ab-1)^2=0
所以 a=b且ab=1 所以a=b=1或a=b=-1
2.x^2+y^2-14x+2y+50=0
x^2-14x+49+y^2+2y+1=0
(x-7)^2+(y+1)^2=0
所以 x=7 y=-1
1.a^2b^2+a^2+b^2+1=4ab
a^2+b^2-2ab+a^2b^2+1-2ab=0
(a-b)^2+(ab-1)^2=0
所以 a=b且ab=1 所以a=b=1或a=b=-1
2.x^2+y^2-14x+2y+50=0
x^2-14x+49+y^2+2y+1=0
(x-7)^2+(y+1)^2=0
所以 x=7 y=-1