题目有误,应该是f(x)=x^2-x+2∵两条曲线分别在P和Q点处的两切线平行∴f(x)和g(x)在x=k处切线斜率相等即f'(k)=g'(k)又f'(x)=2x-1,g'(x)=3/x∴2k^2-1=3/k∴2k^2-k=3解得k=3/2或k=-1又g(x)=3lnx定义域为x>0∴直线x=-1与...