把x=2√2y-3m代入圆中得
(2√2y-3m)^2+y^2-6(2√2y-3m)+5=0
9y^2-(12m√2-12√2)y+9m^2+18m+5=0
Δ=144*2(m^2-2m+1)-4*9(9m^2+18m+5)
由Δ>=0得
-m^2-34m+3>=0
-17-2√73
把x=2√2y-3m代入圆中得
(2√2y-3m)^2+y^2-6(2√2y-3m)+5=0
9y^2-(12m√2-12√2)y+9m^2+18m+5=0
Δ=144*2(m^2-2m+1)-4*9(9m^2+18m+5)
由Δ>=0得
-m^2-34m+3>=0
-17-2√73