已知函数f(x)={x2−13,x>1,x2+x−1,x<1,f(x) = \begin{cases} \dfrac{x^2 - 1}{3}, & x > 1, \\ x^2 + x - 1, & x < 1, \\ \end{cases}f(x)=⎩⎨⎧3x2−1,x2+x−1,x>1,x<1,则f(x)f(x)f(x)在点x=1x = 1x=1处不是左连续的.( )
Copyright ©