x^2+y^2=t
t(t-1)-12=0
t=4
若(x^2+y^2)(x^2+y^2-1)-12=0,且x,y为实数,则x^2+y^2=?
若(x^2+y^2)(x^2+y^2-1)-12=0,且x,y为实数,则x^2+y^2=?
数学人气:965 ℃时间:2020-04-01 10:23:39
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