Matemática, perguntado por danieldealcantara01, 5 meses atrás

1 - determine o MMC de:
(Com cálculos)
A - 30,20,10
B - 15,18,20
C - 27,3,20

2 - Resolva (Com Cálculos)

A) 2/8 + 4/3 + 5/2 - 4/5
B) 7/5 - 6/5 + 3/5
C) 19/2 + 16/3 - 15/5
D) 1/4 + (-3/2 + 3/4 - 6/2) - 2/3

Soluções para a tarefa

Respondido por simonesantosaraujo91
1

Resposta:

Questão 1

A)60

B)180

C)540

Questão 2

A)197/60

B)4/5

C)71/6

D) - 25/6

Explicação passo-a-passo:

Questão 1)

A)30, 20,10

30|20|10|2

15| 10| 5|2

15| 5| 5|3

5| 5| 5|5

1| 1| 1|

2×2×3×5=60

B)15 18 20

15 18 20|2

15 9 10|2

15 9 5|3

5 3 5|3

5 1 5|5

1 1 1 |

2×2×3×3×5=180

C) 27 3 20

27 3 20|2

27 3 10|2

27 3 5|3

9 1 5|3

3 1 5|3

1 1 5|5

1 1 1 |

2×2×3×3×3×5=540

Questão 2

A) 2/8 + 4/3 + 5/2 - 4/5

2/8 + 4/3 + 5/2 - 4/5

2/8

2÷2/8÷2

1/8÷2

2÷2/8÷2

1/4

2/8 + 4/3 + 5/2 - 4/5a aqui risque o numero2 e 8.

1/4 + 4/3 + 5/2 + 4/5

1×15/4×15 + 4/3 + 5/2 - 4/5

1/4 + 4/3 + 5/2 + 4/5

1×15/4×15 + 4×20/3×20 + 5/2 - 4/5

1/4 + 4/3 + 5/2 - 4/5

1×15/4×15 + 4×20/3×20 + 5×30/2×30 - 4/5

1/4 + 4/3 + 5/2 - 4/5

1×15/4×15 + 4×20/3×20 + 5×30/2×30 + 4×12/5×12

15/4×15 + 4×20/3×20 + 5×30/2×30 + 4×12/5×12

1×15/4×15 + 4×20/3×20 + 5×30/2×30 - 4×12/5×12

15/60 + 4×20/3×20 + 5×30/2×30 - 4×12/5×12

1×15/4×15 + 4×20/3×20 + 5×30/2×30 - 4×12/5×12

15/60 + 80/2×20 + 5×30/2×30 - 4×12/5×12

1×15/4×15 + 4×20/3×20 + 5×30/2×30 + 4×12/5×12

15/60 + 80/60 + 5×30/2×30 - 4×12/5×12

1×15/4×15 + 4×20/3×20 + 5×30/2×30 + 4×12/5×12

15/60 + 80/60 + 150/2×30 - 4×12/5×12

1×15/4×15 + 4×20/3×20 + 5×30/2×30 - 4×12/5×12

15/60 + 80/60 + 150/60 - 4×12/5×12

1×15/4×15 + 4×20/3×20 + 5×30/2×30 - 4×12/5×12

15/60 + 80/60 + 150/60 - 48/5×12

1×15/4×15 + 4×20/3×20 + 5×30/2×30 - 4×12/5×12

15/60 + 80/60 + 150/60 - 48/60

15+80+150-48/60

1/4 + 4/3 + 5/2 - 4/5

15+80+150-48/60

15+80+150-48

245-48

197

15+80+150-48/60

197/60

Resposta

197/60

B)7/5 - 6/5 + 3/5

7/5 - 6/5 + 3/5

7-6+3/5

7-6+3

10-6

4

7-6+3/5

4/5

Resposta

4/5

C)19/2 + 16/3 - 15/5

19/2 + 16/3 - 15/5

15/5

15÷5/5÷5

3/5÷5

15÷5/5÷5

3/1

3

19/2 + 16/3 - 15/5 aqui risque os dois numeros 15 e 5

19/2 + 16/3 - 3

19×3/2×3 + 16/3 -3

19/2 + 16/3 - 3

19×3/2×3 + 16×2/3×2 -3

19/2 + 16/3 -3

19×3/2×3 + 16×2/3×2 - 3/1

57/2×3 + 16×2/3×2 - 3/1

19×3/2×3 + 16×3/3×2 - 3/1

57/6 + 16×2/3×2 - 3/1

19×3/2×3 + 16×2/3×2 - 3/1

57/6 + 32/3×2 - 3/1

19×3/2×3 + 16×2/3×2 - 3/1

57/6 + 32/6 - 3/1

19×3/2×3 + 16×2/3×2 - 3/1

57/6 + 32/6 - 3×6/1×6

57/6 + 32/6 - 18/1×6

57/6 + 32/6 - 3×6/1×6

57/6 + 32/6 - 18/6

57+32-18/6

19/2 + 16/3 -3

57+32-18/6

57+32-18

89-18

71

57+32-18/6

71/6

Resposta

71/6

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

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

- 3/2 + 3/4 - 6/2

-3-6/2 + 3/4

-9/2 + 3/4

-18 + 3/4

-15/4

- 15/4

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

1/4+(15/4)-2/3

1/4 - 15/4 - 2/3

1-15/4 - 3/2

-14/4 - 2/3

-14/4 - 2/3 aqui risque os numeros-14 e 4

- 7/2 - 2/3

-21-4/6

-25/6

- 25/6

1/4 - 15/4 - 2/3

- 25/6

Resposta

- 25/6

As contas da questão 1

A) 2 4 12

×2 ×3 ×5

--------- ------- ------

4 12 60

B)2 4 12 36

×2 ×3 ×3 ×5

------- ------ ------- ----------

4 12 36 180

C)2 4 12 36 108

×2 ×3 ×3 ×3 ×5

------- ------ ------- ----- ----------

4 12 36 108 540

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