Question

determine o resultado da seguinte expressão (1/2 - 5/2) x (9/4+8/5)​
E explica oque fez até chegar no resultado obitido

Answer 1

Explicação passo-a-passo:

$\sf \left(\dfrac{1}{2}-\dfrac{5}{2}\right)\times\left(\dfrac{9}{4}+\dfrac{8}{5}\right)$

$\sf =\left(\dfrac{1-5}{2}\right)\times\left(\dfrac{5\cdot9+4\cdot8}{20}\right)$

$\sf =\left(\dfrac{-4}{2}\right)\times\left(\dfrac{45+32}{20}\right)$

$\sf =(-2)\cdot\dfrac{77}{20}$

$\sf =\dfrac{-154}{20}$

$\sf =\dfrac{-77}{10}$

Answer 2

1-5/2.45+32/20
-4/2.77/20
-2.77/20
-154/20=-77/10