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^3-27)/(x-3)=lim (x^2+3x+9)=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