Question

ATIVIDADE 4 - POTENCIAÇÃO DE NÚMEROS RACIONAIS EXPRESSOS
NA FORMA DECIMAL
​

Answer 1

Explicação passo-a-passo:

a)

$\sf (9,1)^2=9,1\cdot9,1$

$\sf (9,1)^2=\dfrac{91}{10}\cdot\dfrac{91}{10}$

$\sf (9,1)^2=\dfrac{8281}{100}$

$\sf (9,1)^2=\red{82,81}$

b)

$\sf (0,5)^3=0,5\cdot0,5\cdot0,5$

$\sf (0,5)^3=\dfrac{5}{10}\cdot\dfrac{5}{10}\cdot\dfrac{5}{10}$

$\sf (0,5)^3=\dfrac{125}{1000}$

$\sf (0,5)^3=\red{0,125}$

c)

$\sf (1,2)^3=1,2\cdot1,2\cdot1,2$

$\sf (1,2)^3=\dfrac{12}{10}\cdot\dfrac{12}{10}\cdot\dfrac{12}{10}$

$\sf (1,2)^3=\dfrac{1728}{1000}$

$\sf (1,2)^3=\red{1,728}$

d)

$\sf (6,21)^2=62,1\cdot6,21$

$\sf (6,21)^2=\dfrac{621}{100}\cdot\dfrac{621}{100}$

$\sf (6,21)^2=\dfrac{385641}{10000}$

$\sf (6,21)^2=\red{38,5641}$