Question

Calcule o valor das expressões

A (8/5) + (8/3)

B (10/8) - (9/7) - (9/8)

Answer 1

Vamos là.

a) 8/5 + 8/3 = 24/15 + 40/15 = 64/15

b) 10/8 - 9/7 - 9/8 = 70/56 - 72/56 - 63/56 = -65/56

Answer 2

Explicação passo-a-passo:

A)

$\dfrac{8}{5} + \dfrac{8}{3}$

\ /

Mmc=>15

$\dfrac{24 + 40}{15}$

\ /

$\dfrac{64}{15}$

B)

$\dfrac{10}{8} - \dfrac{9}{7} - \dfrac{9}{8}$

\ /

$\dfrac{10 - 9}{8} - \dfrac{9}{7}$

\ /

$\dfrac{1}{9} - \dfrac{9}{7}$

Mmc=>56

$\dfrac{7 - 72}{56}$

\ /

$- \dfrac{65}{56}$