解x²-3x-6=0用公式法△=b²-4ac=9+24=33∴x=(3+√33)/2或x=(3-√33)/2 (2x-1)²-64=0(2x-1)²=64∴2x-1=8或2x-1=-8∴x=9/2或x=-7/2
x^2-3x-6=0 x=(3+-根号33)/2（2x-1）^2-64=02x-1=+-8x=9/2 or -7/2
