Giải giúp mình câu 33

`lim (sqrt(4n^2-1)+root(3)(8n^3+2n^2-3))/(sqrt(16n^2+4n)-root(4)(n^4+1))`

`=lim ((sqrt(4n^2-1))/n+(root(3)(8n^3+2n^2-3))/n)/(sqrt(16n^2+4n)/n+(root(4)(n^4+1))/n)`

`=lim (sqrt((4n^2)/n^2-1/n^2)+root(3)((8n^3)/n^3+(2n^2)/n^3-3/n^3))/(sqrt((16n^2)/n^2+(4n)/n^2)+root(4)((n^4)/n^4+1/n^4))`

`=lim(sqrt(4-1/n^2)+root(3)(8+2/n-3/n^3))/(sqrt(16+4/n)-root(4)(1+1/n^4))`

`=(sqrt(4-0)+root(3)(8+0-0))/(sqrt(16+0)-root(4)(1+0))`

`=(2+2)/(4-1)`

`=4/3`