A
<img src="https://tex.z-dn.net/?f=%283-%20%5Cfrac%7B1%7D%7B2%7D%20%29%5E%7B2%7D-%20%5Cfrac%7B0.02%7D%7B1%2F10%7D%2B%20%5Csqrt%5B3%5D%7B%20%5Cfrac%7B7%7D%7B8-1%7D%20%7D%20%20" />
<img src="https://tex.z-dn.net/?f=9-3%2B%20%5Cfrac%7B1%7D%7B4%7D%20-0.2%2B%20%5Csqrt%5B3%5D%7B%20%5Cfrac%7B7%7D%7B7%7D%20%7D%20%20" />
<img src="https://tex.z-dn.net/?f=6%2B%20%5Cfrac%7B1%7D%7B4%7D%20-0.2%2B%20%5Csqrt%5B3%5D%7B%201%7D%20%20" />
<img src="https://tex.z-dn.net/?f=6%2B%20%5Cfrac%7B1%7D%7B4%7D%20-0.2%2B1" />
<img src="https://tex.z-dn.net/?f=7%2B%20%5Cfrac%7B1%7D%7B4%7D%20-0.2" />
Escribiendo la fracción 1 / 4 en forma decimal :
<img src="https://tex.z-dn.net/?f=7%2B%200.25%20-0.2" />
<img src="https://tex.z-dn.net/?f=7%2B%200.05%20" />
<img src="https://tex.z-dn.net/?f=7.05" />
b
<img src="https://tex.z-dn.net/?f=%5B0.05%20%5Csqrt%7B0.81%7D-%28%20%5Cfrac%7B-1%7D%7B2%7D%20%29%5E%7B2%7D%20%5D%2F%281%2B%20%5Cfrac%7B1%7D%7B2%7D%20%29" />
<img src="https://tex.z-dn.net/?f=%5B0.05%20%280.9%29-%28%20%5Cfrac%7B1%7D%7B4%7D%20%29%20%5D%2F%281%2B%20%5Cfrac%7B1%7D%7B2%7D%20%29" />
[img = 10]
[img = 11]
[img = 12]
Si tienes dudas por favor pregúntame.