Question

Transformar problema em equaçoes

Answer 1

Resposta:

8. a) -1/4

b) 15/8

c) 6

d) 25

e) 12

f) 36

Explicação:

8. a) x+3/4 = 1/2

x = 1/2-3/4

x = (4÷2×1)-(4÷4×3)/4

x = (2×1)-(1×3)/4

x = 2-3/4

x = -1/4

b) 2/3×x = 5/4

2/3×x/1 = 5/4

2×x/3×1 = 5/4

2x/3 = 5/4

(12÷3×2x)/12 = (12÷4×5)/12

(4×2x)/12 = (3×5)/12

8x/12 = 15/12

8x = 15

x = 15/8

c) x/2+5 = 8

x/2 = 8-5

x/2 = 3

x/2 = (2÷1×3)/2

x/2 = 6/2

x = 6

d) 2x+3x = 125

5x = 125

x = 125÷5

x = 25

e) x+1/4x = 15

1x+1/4x = 15

1/1x+1/4x = 15

(4÷1×1)+(4÷4×1)/4x = 15

4+1/4x = 15

5/4x = 15

5/4x = 15/1

5/4x = (4÷1×15)/4

5/4x = 60/4

5x = 60

x = 60÷5

x = 12

f) 1/2x+1/3x = 30

(6÷2×1)+(6÷3×1)/6x = 30

3+2/6x = 30

5/6x = (6÷1×30)/6

5/6x = 180/6

5x = 180

x = 180÷5

x = 36