Can someone help me with these Limitations

Oct 2019
4
0
latvia
Screenshot_20200115_092200.jpg
Hey, can someone help me out with this one? Please.
 
Dec 2015
1,078
166
Earth
\(\displaystyle 1+\dfrac{5x+20}{12+5x}-1=1+\dfrac{8}{12+5x}\).
Now bring it to the form as \(\displaystyle \lim_{s\rightarrow \infty} (1+1/s)^s=e\).