Question

Pfvr, me ajudem.

1) Sabendo que a = (2/3)^-1 e b = -5/2, calcule

a) a-b
b) a : b
c) a.b^2
d) (a+b)^2

Answer 1

Resposta:

a)$-1$

b)$\frac{3}{5}$

c)$\frac{9}{5}$

d)8

Explicação passo a passo:

$a)\\(\frac{2}{3})^-^1 -(-\frac{5}{2})\\ \frac{3}{2}-\frac{5}{2} \\\\\frac{-2}{2}\\-1$

$b)\\(\frac{2}{3})^-^1 -(-\frac{5}{2})\\\frac{3}{2} :\frac{5}{2}\\\frac{3}{2} *\frac{2}{5}\\\\\frac{6}{10}\\\frac{3}{5}$

$c)\\((\frac{2}{3})^-^1 -(-\frac{5}{2}))^2\\(\frac{3}{2} *\frac{5}{2})^2\\(\frac{6}{10})^2\\\frac{6}{10}*\frac{6}{10}\\\frac{36}{20} :4\\\frac{9}{5}$

$d)\\((\frac{2}{3})^-^1 -(-\frac{5}{2}))^2\\(\frac{3}{2} +\frac{5}{2})^2\\(\frac{8}{2}) ^2\\\frac{8}{2}*\frac{8}{2}\\\frac{16}{2}\\ 8$

Se te ajudei, marque com melhor resposta, por favor.