Question

Me ajudem a fazer esses cálculos pfv

Answer 1

Resposta:

05. Resposta (D)

06. Resposta (B)

07. Resposta (C)

08. Resposta (D)

Explicação passo a passo:

05. $\frac{2}{3} + \left[\frac{3}{5}\left(\frac{2}{3}-\frac{1}{2}\right)\right] = \frac{2}{3} + \left[\frac{3}{5}\left(\frac{1}{6}\right)\right] = \frac{2}{3} + \left[\frac{1}{10}\right] = \frac{20 + 3 }{30} = \frac{23}{30}$

06. $3,5+2,4\cdot 6,5 = 3,5 + 15,6 = 19,10$

07. $\left(-\frac{1}{2}\right)^{3}+\frac{2}{3}\cdot 5 = \left(-\frac{1}{8}\right) + \frac{10}{3} = \frac{-3 + 80}{24} = \frac{77}{24}$

08. $\left(2-\frac{1}{2}\right)^{2} : \left(2+\frac{1}{2}\right)^{2} = \left(\frac{3}{2}\right)^{2} : \left(\frac{5}{2}\right)^{2} = \frac{9}{4} : \frac{25}{4} = \frac{9}{25}$