lim x 趋向于3,x-3分之x的3次方-27,
问题描述:
lim x 趋向于3,x-3分之x的3次方-27,
答
lim (x-3)(x²+3x+9)/(x-3) x 趋向于3
=lim (x²+3x+9) x 趋向于3
=27