Question

Calcule o valor das expressões e apresente o resultado na forma de fração irredutível A) 0,5+ 1/4×1/3B) 1/2+1/3÷5/6C) 1/4×0,5+1/2 D) 15÷(3/4 - 1/4)E) ( 3 + 1/2 ) × 4/5F) ( 0,75 + 1/4 ) ÷ 2/5 + 1/2 Com cálculo pfv

Answer 1

A) 0,5 + 1/4 × 1/3 =
5/10 + 1*1/4*3 =
1/2 + 1/12 = (MMC = 12)
6/12 + 1/12 =
7/12

B) 1/2 + 1/3 ÷ 5/6 = 
1/2 + [1/3 * 6/5] = 
1/2 + 1*6/3*5 =
1/2 + 6/15 = (MMC = 30)
1*15/30 + 6*2/30 =
15/30 + 12/30 =
27/30 =
9/10

C) 1/4 × 0,5 + 1/2 =
1/4 * 5/10 + 1/2 =
1/4 * 1/2 + 1/2 =
1*1/4*2 + 1/2 =
1/8 + 1/2 = (MMC = 8)
1/8 + 1*4/8 =
1/8 + 4/8 =
5/8

D) 15 ÷ (3/4 - 1/4) =
15 : 2/4 =
15 : 1/2 =
15 * 2 =
15

E) ( 3 + 1/2 ) × 4/5 =
[3*2/2 + 1/2] * 4/5 =
[6/2 + 1/2] * 4/5 =
7/2 * 4/5 =
7*4/2*5 =
28/10 =
14/5

F) ( 0,75 + 1/4 ) ÷ 2/5 + 1/2 = 
[75/100 + 1/4] : 2/5 + 1/2 =
[3/4 + 1/4] : 2/5 + 1/2 =
4/4 : 2/5 + 1/2 =
1 : 2/5 + 1/2 =
1*5/2 + 1/2 =
5/2 + 1/2 =
6/2 =
3