x的平方-5x=14,
则x²-5x-14=0
则(x-7)(x+2)=0
则x=7或-2
x=7时,(x-1)(2x-1)-(x+11)=(7-1)*(14-1)-18=70
x=-2时,(x-1)(2x-1)-(x+11)=(-2-1)*(-4-1)-9=6