Question

Simplifique:

A)1/2 - 3/4 + 2/3 - 5/6 =

B)5/6 - 4/5 - 7/15 + 1/2 + 1/3 =

Simplifique:

A)- 1/2 (2/1 - 1/3) + 1/4 - (-3 + 1/2)=

Obrigado agradeço

Answer 1

Resposta:

A1) -5/12= 0.42

B) 2/5 = 0.4

A2) 23/12 = 1,92

Explicação passo-a-passo:

A1)1/2 - 3/4 + 2/3 - 5/6 =

(1x6)/(2x6) - (3x3)/(4x3) +(2x4)/(3x4) - (5x2)/(6x2) =

6/12 - 9/12 + 8/12 - 10/12 =

(6-9+8-10)/12 =

-5/12= 0.42

B) 5/6 - 4/5 - 7/15 + 1/2 + 1/3 =

(5x5)/(6x5) - (4x6)/(5x6) -  (7x2)/(15x2) + (1x15)/(2x15) + (1x10)/(3x10) =

25/30 - 24/30 - 14/30 + 15/30 +10/30 =

(25-24-14+15+10)/30 =

12/30 =

2/5 = 0.4

A2) - 1/2 (2/1 - 1/3) + 1/4 - (-3 + 1/2) =

-1/2 [(2x3)/(1x3) - 1/3] + 1/4 - [(-3x2)/(1x2) 1/2] =

-1/2 (6/3 - 1/3) + 1/4 - (-6/2+ 1/2) =

-1/2 (5/3) +1/4 - (-5/2) =

-5/6 +1/4 + 5/2 =

(-5x2)/(6x2) + (1x3)/(4x3) + (5x6)/(2x6) =

-10/12 + 3/12 + 30/12 =

(-10+3+30)/12 =

23/12 = 1,92