(x+1)^2=6xx^2+2x+1-6x=0x^2-4x+1=0x=2+根号3 或者2-根号3
x²+2x+1=6xx²-4x=-1x²-4x+4=-1+4(x-2)²=3x-2=±√3x=2-√3，x=2+√3
(x+1)²=6xx²+2x+1-6x=0x²-4x+1=0x²-4x+4=-1+4(x-2)²=3x-2=±√3x=2±√3
