\(M=\lim\limits\left(\sqrt[3]{1-n^2-8n^3}+2n\right)\)

\(=\lim\limits\dfrac{1-n^2-8n^3+8n^3}{\left(\sqrt[3]{1-n^2-8n^3}\right)^2-2n.\sqrt[3]{1-n^2-8n^3}+4n^2}\)

\(=\lim\limits\dfrac{1-n^2}{\left(1-n^2-8n^3\right)^{\dfrac{2}{3}}-2n.\left(1-n^2-8n^3\right)^{\dfrac{1}{3}}+4n^2}\)

\(=\lim\limits\dfrac{-\dfrac{n^2}{n^2}}{\dfrac{\left(-8n^3\right)^{\dfrac{2}{3}}}{n^2}-\dfrac{2n.\left(-8n^3\right)^{\dfrac{1}{3}}}{n^2}+\dfrac{4n^2}{n^2}}=\dfrac{-1}{4+4+4}=-\dfrac{1}{12}\)

\(E=\lim\limits\dfrac{\sqrt{n^3+2n}+1}{n+2}=\lim\limits\dfrac{\dfrac{\left(n^3+2n\right)^{\dfrac{1}{2}}}{n}+\dfrac{1}{n}}{\dfrac{n}{n}+\dfrac{2}{n}}=\dfrac{\dfrac{n^{\dfrac{3}{2}}}{n}}{\dfrac{n}{n}}=0\)

\(B=\lim\limits\left(\sqrt{2n^2+1}-n\right)?\)

\(B=\lim\limits\left[n\left(\sqrt{\dfrac{2n^2}{n^2}+\dfrac{1}{n^2}}-\dfrac{n}{n}\right)\right]=\lim\limits\left[n\left(\sqrt{2}-1\right)\right]=+\infty\)

\(A=\lim\limits\left(\sqrt{n^2+2n+2}+n\right)=\lim\limits\dfrac{n^2+2n+2-n^2}{\sqrt{n^2+2n+2}-n}=\dfrac{\dfrac{2n}{n}+\dfrac{2}{n}}{\sqrt{\dfrac{n^2}{n^2}+\dfrac{2n}{n^2}+\dfrac{2}{n^2}}-\dfrac{n}{n}}=\dfrac{2}{1-1}=+\infty\)

Lạ nhỉ, tui chả biết dạng này dạng gì nữa :D

\(\lim\limits\dfrac{\left(n+1\right)\left(\sqrt{3n^2+2}+\sqrt{3n^2-1}\right)}{n^2\left(3n^2+2-3n^2+1\right)}=\lim\limits\dfrac{\left(\dfrac{n}{n}+\dfrac{1}{n}\right)\left(\sqrt{\dfrac{3n^2}{n^2}+\dfrac{2}{n^2}}+\sqrt{\dfrac{3n^2}{n^2}-\dfrac{1}{n^2}}\right)}{3n^2}=\dfrac{2\sqrt{3}}{3}=\dfrac{2}{\sqrt{3}}\)

Cậu ơi :( Cậu chụp cái đề lên được ko, khó hịu thực sự :( 

Được rồi, biết gõ công thức rồi đó :)

\(D=\lim\limits\dfrac{n+1}{n^2\left(\sqrt{3n^2+2}-\sqrt{3n^2-1}\right)}\)

\(D=\lim\limits\dfrac{\dfrac{n}{n^3}+\dfrac{1}{n^3}}{\dfrac{n^2.\left(3n^2+2\right)^{\dfrac{1}{2}}}{n^3}-\dfrac{n^2\left(3n^2-1\right)^{\dfrac{1}{2}}}{n^3}}=0\)

Dung ko nhi :D?

Chụp ảnh hoặc sử dụng gõ công thức nhé bạn. Để vầy khó hiểu lắm