Por favor ayuda con estos problemas?

Hola.

Solo vamos a reemplazar.

1. 2(6) + 2(4) = 12 + 8 = 20

2.

<img src="https://tex.z-dn.net/?f=2%28-1%29%5E2-3%28-1%29%2B4%20%3D%202%2B3%2B4%20%3D%209" />

3.

- 3 (3 + 1) - 2(3) = - 12 - 6 = - 18

4.

<img src="https://tex.z-dn.net/?f=4%28-2%29%283%29-%283%29%5E2-%28-2%29%5E2%20%3D%20-37" />

5.

<img src="https://tex.z-dn.net/?f=-7%285%29%5E3%2B3%285%29%5E2-5%285%29%20%3D%20-825" />

6.

<img src="https://tex.z-dn.net/?f=-2%28-3%28-6%29%5E2%2B4%28-6%29%29%20%3D%20264" />

7.

<img src="https://tex.z-dn.net/?f=%20%5Csqrt%7B%289%29%284%29%7D-2%289%29%2B%284%29%5E2%20%3D%204" />

8.

<img src="https://tex.z-dn.net/?f=-2%20%5Csqrt%7B20-%28-5%29%7D%20%3D%20-10" />

9.

<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B8%284%29%7D%7B2%283%29-2%7D%20%20%3D%208" />

10.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cleft%282%5Cright%29%5E2%7D%7B2%5Cleft%281%5Cright%29%7D%5C%3A%2B%5C%3A%5C%3A%5Cfrac%7B2%5Cleft%281%5Cright%29%5E2%7D%7B2%7D%20%3D%203" />

Nota : Ya sabes solo es reemplazar y hacer las operaciones.

¡Espero haberte ayudado, saludos!