Question

Resolva as equações: 1)x+5=8 2)x-4=3. 3)x+6=5. 4)x-7=7. 5)3x=15. 6)x/3=7. 7)2x=14. 8)x/4=-3. 9)4x=-12. 10)2x/5=4

Answer 1

Explicação passo-a-passo:

1)

X + 5 = 8

X = 8 - 5

X = 3

2)

X - 4 = 3

X = 3 + 4

X = 7

3)

X + 6 = 5

X = 5 - 6

X = -1

4)

X - 7 = 7

X = 7 + 7

X = 14

5)

3x = 15

X = 15/3

X = 5

6)

X ÷ 3 = 7

X = 7 × 3

X = 21

7)

2x = 14

X = 14/2

X = 7

8)

X ÷ 4 = -3

X = -3 × 4

X = -12

9)

4x = -12

X = -12/4

X = - 3

10)

2x ÷ 5 = 4

2x = 4 × 5

2x = 20

X = 20/2

X = 10

Answer 2

Resposta:

1)

x + 5 = 8

x = 8 - 5

x = 3

2)

x - 4 = 3

x = 3 + 4

x = 7

3)

x + 5 = 6

x = 6 - 5

x = 1

4)

x - 7 = 7

x = 7 + 7

x = 14

5)

3x = 15

x = 15/3

x = 5

6)

x/3 = 7

3 • x/3 = 3 • 7

3÷3 • x/3÷3 = 3 • 7

1 • x/1 = 3 • 7

x = 7 • 3

x = 21

7)

2x = 14

x = 14/2

x = 7

8)

x/4 = - 3

4 • x/4 = 4 • (- 3)

4÷4 • x/4÷4 = 4 • (- 3)

1 • x/1 = 4 • (- 3)

x = 4 • (- 3)

x = - 4 • 3

x = - 12

9)

4x = - 12

x = - 12/4

x = - 3

10)

2x/5 = 4

5/2 • 2x/5 = 5/2 • 4

5÷5/2 • 2x/5÷5 = 5/2 • 4

1/2 • 2x/1 = 5/2 • 4

1/2 • 2x = 5/2 • 4

1/2÷2 • 2÷2x = 5/2 • 4

1/1 • x = 5/2 • 4

x = 5/2 • 4

x = 5/2÷2 • 4÷2

x = 5/1 • 2

x = 5 • 2

x = 10

Espero ter ajudado!!!