Question

Se A= (x - y)/xy, x= 2/5 e y=1/2, então determine o valor de A:

A) 2/5
B) 1/3
C) -1/2
D) 1/2
E) 1

Answer 1

Boa tarde Ana

A = (x - y)/xy = 1/y - 1/x

x = 2/5, y = 1/2

1/(1/2) - 1/(2/5) = 2 - 5/2 = 4/2 - 5/2 = -1/2 (C)