题目若xxx、yyy为实数,且(x2+y2)(x2+y2−1)=12(x^{2}+y^{2})(x^{2}+y^{2}-1)=12(x2+y2)(x2+y2−1)=12,则(x2+y2)=______.(x^{2}+y^{2})=\_\_\_\_\_\_.(x2+y2)=______.知识点：解一元二次方程——换元法章节：未标注
