Question

preciso urgentee, agradeço desde ja ​

Answer 1

Resposta:

a) X =  $\frac{31}{108}$

b) y= - 15

Explicação passo-a-passo:

2. Calcule o valor de:

a) x = ( $\frac{-1}{3}$ ) $^{3}$ + [ 3 $^{-1}$  – ( -3) $^{-1}$  ]

$^{-2}$

x = (  $\frac{-1}{27}$)  + [ $\frac{1}{3}$ – ( $\frac{-1}{3}$)]$^{-2}$  

x= ($\frac{-1}{27}$) + ($\frac{1}{3}$+ $\frac{1}{3}$ ) $^{-2}$  

x = $\frac{-1}{27}$ + ( $\frac{2}{3}$)$^{-2}$  

x = $\frac{-1}{27}$ + ( $\frac{3}{2}$)$^{2}$  

x = $\frac{-1}{27}$ +  $\frac{9}{4}$

$\frac{108x}{108}$ = $\frac{4}{108}$  +

$\frac{27}{108}$

108x= 4 + 27

X = $\frac{31}{108}$

b) y= 2-2 +22 – 2-1 / 2-2 – 2-1

y= ¼ + 4 – ½ / ¼ - ½

y = ¼ + 16/4 – 2/4 / ¼ - 2/4

y= 15/4 / - ¼

y=  $\frac{15}{4}$ .    $\frac{-4}{1}$

y=  $\frac{-60}{4}$

y= - 15