limx→1(xˆ3-3x+2)/(xˆ4-4x+3)怎么解?

问题描述:

limx→1(xˆ3-3x+2)/(xˆ4-4x+3)怎么解?
不用洛必达法则

lim(x→1)(xˆ3-3x+2)/(xˆ4-4x+3)
=lim(x→1)(x-1)²(x+2)/(x-1)²(x²+2x+3)
=lim(x→1)(x+2)/(x²+2x+3)
=3/6
=1/2