Efetue as subtraçoes : c) (+2/3)-(+4/5) = D) (-7/8)-(-3/4)= E) (-2/5)-(-1/4)= F) (-1/2)-(+5/8)= G) (+2/3)-(+1/5)= H) (-2/5)-(+1/2) =
Soluções para a tarefa
Resposta:
c) (+2/3)-(+4/5) =
D) (-7/8)-(-3/4)=
- 7/8 + 3/4 = MMC(8, 4) = 8
-7/8 + 6/8 = 8 , 4 |2
- 1/8 4, 2 |2
2, 1 |2
1, 1 |2 . 2 . 2 = 8
E) (-2/5)-(-1/4)=
- 2/5 + 1/4 = MMC(5, 4) = 20
- 8/20 + 5/20 5, 4 |2
- 3/20 5, 2 |2
5, 1 |5
1 , 1 |2 . 2 . 5 = 20
F) (-1/2)-(+5/8) =
- 1/2 - 5/5 = MMC(2, 5) = 10
- 2/10 - 10/ 10 = 2, 5 |2
- 12/10 =(fatore dividindo por 2) 1, 5 |5
- 6/5 1, 1 |2 . 5 = 10
G) (+2/3)-(+1/5) =
2/3 - 1/5 = MMC(3, 5) = 15
10/15 - 3/15 = 3, 5 |3
7/15 1, 5 |5
1, 1 |3 . 5 = 15
H) (-2/5)-(+1/2) =
- 2/5 - 1/2 = MMC(5, 2) = 10
- 4/10 - 5/10 = 5, 2 |2
- 9/10 5, 1 |5
1, 1 |2 . 5 = 10
Espero ter ajudado.
Explicação passo-a-passo: