求极限lim(x→2)(x^2-3x+2)/(x^2+4x-12)
问题描述:
求极限lim(x→2)(x^2-3x+2)/(x^2+4x-12)
答
lim(x→2)(x^2-3x+2)/(x^2+4x-12)
=lim(x→2)(x-2)(x-1) / (x-2)(x+6)
=lim(x→2) (x-1)/(x+6)
=(2-1) /( 2+6)
=1/8