设y=x^2-x,原方程可简化为,y^2-4y-12=0(y+2)(y-6)=0y=-2或y=6即x^2-x=-2或x^2-x=6解第一个：x^2-x=-2x^2-x+2=0(x-1/2)^2+3/4=0(x-1/2)^2=-3/4无实数解；解第二个：x^2-x-6=0（x+2)(x-3)=0x=-2或X=3综上：x=-2或3...