求解根式方程x^2
x^2-6x-6+x*根号下x^2-2x-2=0
x^2-6x-6+x*(x^2-2x-2)^0.5=0 x^2-6x-6=-x*(x^2-2x-2)^0.5 (x^2-6x-6)^2=[-x*(x^2-2x-2)^0.5]^2 x^4+36x^2+36-12x^3-12x^2+72x=x^4-2x^3-2x^2 -5x^3+13x^2+36x+18=0 (x+1)(-5x^2+18x+18)=0 x1=-1,x2,3=(9±171^0.5)/5 经检验,