Question

f(x)＝(x²-1)/(x+1)的间断点

Answer 1

f(x)＝(x²-1)/(x+1)
x=-1为间断点
f(x)=x-1
limf(x)=lim(x-1)=-2
x→-1(+)
limf(x)=lim(x-1)=-2
x→-1(-)
f(x)在x=-1处左右极限相等，x=-1为第一间断点（可去间断点）