Question

Calcule o valor das expressões. (Fração).

A)2/5+1/2-1/3
B)3/4x5/6+1/2
C)2/3+1/4x3
D)3/4:1/2-2/3
E)3/5+1/5:1/10
F)2 1/2+3/2x1/2.

Cálculos pfv.

Answer 1

a) 2/5 + 1/2 - 1/3 = (12 + 15 - 10)/30 = 17/30

b) 3/4 x 5/6 + 1/2 = (9/12) x (10/12) + 1/2 = 90/144 + 72/144 = 162/144 = 9/8

c) 2/3 + 1/4 x 3 = 2/3 + 3/4 = 8/12 + 9/12 = 17/12

d) 3/4 : 1/2 - 2/3 = 3/4 x 2/1 -2/3 = 6/4 - 2/3 = 18/12 - 8/12 = 10/12 = 5/6 

e) 3/5 + 1/5 : 1/10 = 3/5+1/5 x 10/1 = 3/5+10/5 = 18/5

F)2 1/2 + 3/2 x 1/2 = 2 1/2 + 3/4 = 5/2 + 3/4 = 10/4 + 3/4 = 13/4