lim x 趋向于3,x-3分之x的3次方-27,
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lim x 趋向于3,x-3分之x的3次方-27,
lim x 趋向于3,x-3分之x的3次方-27,
lim x 趋向于3,x-3分之x的3次方-27,
lim (x-3)(x²+3x+9)/(x-3) x 趋向于3
=lim (x²+3x+9) x 趋向于3
=27
lim (x^3-27)/(x-3)=lim (x^2+3x+9)=27
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