求证limx→-3 (1+3x)/(x-1)=2
问题描述:
求证limx→-3 (1+3x)/(x-1)=2
rt
答
解 1+3x 3(x-1)+4 4 4
lim----------------------=lim -----------------=3 + lim---------------=3+ ----------= 3-1=2
x→-3 x-1 x→-3 x-1 x→-3 x-1 -3-1