lim(x趋于-2)x^2-x-6/x^2+3x+2

问题描述:

lim(x趋于-2)x^2-x-6/x^2+3x+2

原式=lim(x趋于-2)(x-3)(x+2)/(x+1)(x+2)
=lim(x趋于-2)(x-3)/(x+1)
=(-2-3)/(-2+1)
=5