x(x-6)=2x2-6x=2x2-6x+9=2+9(x-3)2=11x-3=±根号11x1=3+根号11x2=3-根号11不明白可以再问
x2-6x-2=0用公式法:a=1 b=-6 c=-2b2-4ac=36+8=44-b+-根号下b2-4ac/2a=6+-2根号下11/2
x²-6x-2=0△=6²+4×2=44x=(6±2√11)/2x=3+√11x=3-√11
x(x-6)=2x²-6x=2x²-6x+9=2+9(x-3)²=11x=3±√11