\(\lim\limits_{ }\sqrt[3]{27n^3-7n^2}-3n=\lim\limits\dfrac{\left(27n^3-7n^2\right)-27n^3}{\left(\sqrt[3]{27n^3-7n^2}\right)^2+\sqrt[3]{27n^3-7n^2}.3n+9n^2}_{ }=\)
\(\lim\limits_{ }\dfrac{-7n^2}{n^2\left[\left(\sqrt[3]{27-\dfrac{7}{n}}\right)^2+\sqrt[3]{27-\dfrac{7}{n}}.3+9\right]}=\dfrac{-7}{27}\)
Nhờ các cao thủ giải dùm mình cái nha. Tks.
Tìm Lim (3√27n3−7n2−3n27n3−7n23−3n )