$$\lim_{x\rightarrow\infty}\ \left(\sqrt{\left(2x-5\right)\left(2x+1\right)}-\left(2x-5\right)\right)=...$$  

$$\lim_{x\rightarrow\infty}\ \left\{\sqrt{x^2+x}-\sqrt{x^2-3x+1}\right\}=...$$  

$$\lim_{x\rightarrow\infty}\left\{\sqrt{x^2-4x+5}-\sqrt{4x^2-x+3}\right\}=....$$  

$$\lim_{x\rightarrow\infty}\ \left(\left(2x-1\right)-\sqrt{2x^2-6x-5}\right)=...$$  

$$\lim_{x\rightarrow\sim}\ \left\{\ \sqrt{ax^2+bx+c}-\sqrt{px^2+qx+r}\right\}=$$ dengan  $$a=p$$   

$$\lim_{x\rightarrow\infty}\left\{\ \left(3x-2\right)-\sqrt{9x^2-2x+5}\right\}=...$$