14.(2023春•平顶山期末)若曲线f(x)=x2+lnx−axf(x)=x^{2}+lnx-axf(x)=x2+lnx−ax在x=1x=1x=1处的切线垂直于直线2y+x−2=02y+x-2=02y+x−2=0,则a=(a=(a=( )))