Question

1°) Calcule as operações com Frações:
a) ¾+⅖=
b) ⅚× ⅗=
c) ⅘÷½=
d) (⅔)²=​

Answer 1

Resposta:

A)23/20

B)1/2

C)8/5

D)4/9

Explicação passo-a-passo:

A)3/4+2/5=

3/4+2/5

3×5/4×5+2/5

3/4+2/5

3×5/4×5+2×4/5×4

15/4×5+2×4/5×4

3×5/4×5+2×4/5×4

15/20×2×4/5×4

3×5/4×5+2×4/5×4

15/20+8/5×4

3×5/4×5+2×4/5×4

15/20+8/20

15+8/20

3×4+2×5

15+8/20

23/20

Resposta

23/20

B)5/6×3/5=

5/6×3×5 cancele os números 5 e 5 risque os dois numeros 5

1/6×3

5/6×3/5 risque os dois numeros 6 e 5

1/2

Resposta

1/2

C)4/5÷1/2=

4/5×1/2

4/5×2

4/5×2/1

4×2/5×1

8/5×1

4×2/5×1

8/5

4/5×2

8/5

Resposta

8/5

D)(2/3)^2=

(2/3)^2

2^2/3^2

2^2

2×2

4

2^2/3^2

4/3^2

3^2

3×3

9

2^2/3^2

4/9

Resposta

4/9