已知(x²+y²)(x²+y²-8)+16=0 求x²+y²的值
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已知(x²+y²)(x²+y²-8)+16=0 求x²+y²的值
已知(x²+y²)(x²+y²-8)+16=0 求x²+y²的值
已知(x²+y²)(x²+y²-8)+16=0 求x²+y²的值
(x^2+y^2)(x^2+y^2-8)+16=0 (x^2+y^2)^2-8(x^2+y^2)+16=0 (x^2+y^2-4)^2=0 x^2+y^2-4=0 x62+y^2=4