Por favor me podéis ayudar con eso, pero explícamela no solo el resultado?

Respuesta : <img src="https://tex.z-dn.net/?f=2" />Explicación paso a paso : Tenemos : <img src="https://tex.z-dn.net/?f=%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B1%7D%7B2%7D%20%5Ctimes%20%5Cfrac%7B2%7D%7B3%7D%29%20%5Cdiv%20%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7B%281-%5Cfrac%7B5%7D%7B6%7D%20%29%281%2B%5Cfrac%7B5%7D%7B6%7D%20%29%2B%5Cfrac%7B1%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%20%29" />Haré paso por paso, y le pondré un número a cada paso, así si te surge alguna duda solamente me dices en qué paso fue.

1. <img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B1%7D%7B2%7D%20%5Ctimes%20%5Cfrac%7B2%7D%7B3%7D%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B%281-%5Cfrac%7B5%7D%7B6%7D%20%29%281%2B%5Cfrac%7B5%7D%7B6%7D%20%29%2B%5Cfrac%7B1%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%20%29" />2.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B6%7D%20%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B%281-%5Cfrac%7B5%7D%7B6%7D%20%29%281%2B%5Cfrac%7B5%7D%7B6%7D%20%29%2B%5Cfrac%7B1%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%20%29" />3.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B6%7D%20%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B%281-%28%5Cfrac%7B5%7D%7B6%7D%29%5E2%29%2B%5Cfrac%7B1%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%20%29" />4.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B6%7D%20%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B1-%5Cfrac%7B25%7D%7B36%7D%2B%5Cfrac%7B1%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%20%29" />5.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B6%7D%20%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B%5Cfrac%7B36%7D%7B36%7D%20-%5Cfrac%7B25%7D%7B36%7D%2B%5Cfrac%7B1%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%20%29" />6.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B6%7D%20%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B%5Cfrac%7B36-25%2B1%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%29" />7.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B6%7D%20%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B%5Cfrac%7B12%7D%7B36%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%29" />8.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B%28%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B6%7D%20%29%7D%7B%28%5Cfrac%7B1%7D%7B5%7D%20%2B%5Cfrac%7B4%7D%7B3%7D%20%29%7D%7D%7B%5Cfrac%7B1%7D%7B3%7D%20%7D%5Ctimes%20%281%2B%5Cfrac%7B2%7D%7B21%7D%29" />9.

[img = 10]10.

[img = 11]11.

[img = 12]12.

[img = 13]13.

[img = 14]14.

[img = 15]15.

[img = 16]16.

[img = 17]17.

[img = 18]18.

[img = 19]19.

[img = 20]20.

[img = 21]21.

[img = 22]22.

[img = 23]Y listo, espero haberte ayudado, éxitos en tu estudio.