设f(x)=[|x|(x+2)]/[x(x+1)],则x=0是______间断点,x=-1是间断点.
因为 x=0使f(x)无定义 limx→0+=limx→0+[x(x+2)]/[x(x+1)]=limx→0+[(x+2)/(x+1)]=2 limx→0-=limx→0-[-x(x+2)]/[x(x+1)]=limx→0-[-(x+2)/(x+1)]=-2 所以 limx→0+f(x)≠limx→0-f(x) 所以 x=0是f(x)的跳跃间断点 limx→-1f(x)=limx→-1[-x(x+2)]/[x(x+1)]=limx→-1[-(x+2)/(x+1)]=∞ 所以 x=-1是f(x)的无穷间断点.