Hola,
A)
El volumen del cubo de aristas 3cm es igual a
<img src="https://tex.z-dn.net/?f=V%3D%283cm%29%283cm%29%283cm%29" />
<img src="https://tex.z-dn.net/?f=V%3D27cm%20%5E%7B3%7D%20" />
B)
El volumen del nuevo cubo es igual a
<img src="https://tex.z-dn.net/?f=V%3D%28%283cm%293%29%28%283cm%293%29%28%283cm%293%29" />
<img src="https://tex.z-dn.net/?f=V%3D%289cm%29%289cm%29%289cm%29" />
<img src="https://tex.z-dn.net/?f=V%3D729cm%20%5E%7B3%7D%20" />
C)
La diferencia entre los volumenes es igual a
<img src="https://tex.z-dn.net/?f=D_V%3DV_f-Vi" />
<img src="https://tex.z-dn.net/?f=D_V%3D729cm%5E%7B3%7D%20-27cm%5E%7B3%7D" />
<img src="https://tex.z-dn.net/?f=D_V%3D702cm%20%5E%7B3%7D%20" />
D)
La razon entre los volumenes es de :
<img src="https://tex.z-dn.net/?f=r%3D%20%5Cfrac%7BV_i%7D%7BV_f%7D%20" />
<img src="https://tex.z-dn.net/?f=r%3D%5Cfrac%7B27cm%5E%7B3%7D%20%7D%7B729cm%20%5E%7B3%7D%20%7D" />
[img = 10]
[img = 11]
Espero haberte ayudado.