Question

calcule o valor das expressões A) 1/2- (1/4-1/8) = B) (1/2- 1/4) -1/8 =

Answer 1

A)
1/2 - (1/4 - 1/8) = 
1/2 - (2/8 - 1/8) =
1/2 - (1/8)
1/2 - 1/8
4/8 - 1/8 = 3/8
B)

(1/2 - 1/4 ) - 1/8 =
2/4 - 1/4) - 1/8 =
1/4 - 1/8 = 2/8 -1/8
=1/8