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
Respostas
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