Question

Sendo x = 9/4 ,y = -7/2 ,w = -3\4 e z = 4\5, determine. O valor de k de acordo com o esquema

Answer 1

x + y = 9/4 + -7/2 = 9/4 - 14/4 = -6/4
w + z = -3/2 + 4/5 = -15/10 + 8/10 = -7/10
(x + y).(w + z) = -6/4 . -7/10 = -60/-28
Simplificando -60/-28 = 15/7 
K = 15/7