4)Aplique a Regra das operações entre frações e encontre as soluções.
a)2/8 + 1/7 =
b) (-3/4)+2/7 =
c)1/9×(-8/3)=
d)2/8 : 3/7 =
e)(-8/4)×(-6/3) =
F)(-1/5) + (-1/5) =
Soluções para a tarefa
A)11/28
B)- 13/38
C)- 8/27
D)7/12
E)4
F)- 2/5
A)2/8 + 1/7=
2/8 + 1/7
2/8
2÷2/8÷2
1/8 ÷ 2
2÷2/8÷2
1/4
+ 1/7
1/4 + 1/7
1×1/4×7 + 1/7
1/4 + 1/7
1×7/4×7 + 1×4/7×4
7/4×7 + 1/4/7×4
1×7/4×7 + 1×4/7×4
7/28 + 1×4/7×4
1×7/4×7 + 1×4/7×4
7/28 + 4/7×4
1×7/4×7 + 1×4/7×4
7/28 + 4/28
7+4/28
1/4 + 1/7
7+4/28
11/28
Resposta
11/28
B)(- 3/4)+2/7
(-3/4)+2/7
- 3/4 + 2/7
-21 + 8/28
-13/28
-13/28
- 3/4 + 2/7
-13/28
Resposta
-13/28
C)1/9×(-8/3)
1/9×(-8/3)
- 1/9× 8/3
1/9×(-8/3)
- 1/9 × 8/3
- 1×8/9×3
- 8/9×3
- 1×8/9×3
- 8/27
1/9×(-8/3)
- 8/27
Resposta
- 8/27
D)2/8 ÷ 3/7
2/8 ÷ 3/7
2/8 × 7/3
2/8 ÷ 3/7 aqui risque os dois numeros 2 e 8
1/4 × 7/3
1×7/4×3
7/4×3
1×7/4×3
7/12
1/4 × 7/3
7/12
Resposta
7/12
E)(- 8/4) × (- 6/3)
(- 8/4) × (- 6/3)
8/4 × 6/3
(- 8/4) × (- 6/3) aqui risque os dois numeros 8 e 4
2× 6/3
(- 8/4) × (- 6/3) aqui risque os dois numeros 6 e 3
2×2
4
Resposta
4
F)(- 1/5) + (- 1/5)
(- 1/5) + (- 1/5)
- 1/5 + (- 1/5)
(- 1/5) + (- 1/5)
- 1/5 - 1/5
-1 -1/5
- 2/5
- 2/5
- 1/5 - 1/5
- 2/5
resposta
- 2/5