Câu 29:
Tính limx→3(1x−13)1(x−3)3\mathop {\lim }\limits_{x \to 3} \left( {\dfrac{1}{x} - \dfrac{1}{3}} \right)\dfrac{1}{{{{\left( {x - 3} \right)}^3}}}x→3lim(x1−31)(x−3)31 bằng:
