Question

{1/2+(3/2-1/2)+[3/4-(2/7+1/4)]}= 1/2-(4/5+1/1)2/3=

Answer 1

Vamos là.

a)

{1/2 + (3/2 - 1/2) + [3/4 - (2/7 + 1/4)]} =

mmc(4,7) = 28

(1/2 + (3/2 - 1/2) + (3/4 - 8/28 - 7/28))) =

3/2 + 21/28 - 15/28 =

42/28 + 21/28 - 15/28 = (63 - 15)/28 = 48/28 = 12/7