Question

a) 2x/8 - 2x/12 = 6

b)6x/8 - 2x/6 = 10

c)2x/10 - 2 = 18

Qual a resposta?$a) \frac{2x}{8} - \frac{2x}{12}=6 b) \frac{6x}{8} - \frac{2x}{6}=10 c) \frac{2x}{10} -2=18$

Answer 1

A)

2x/8 - 2x/12 = 6

x/4 - x/6 = 6

MMC = 12

4,6: 2

2,3: 2

1,3: 3

1,1 = 2.2.3 = 12

(3x - 2x)/12 = 12.6/12

3x - x = 72

x = 72

b)

6x/8 - 2x/6 = 10

3x/4 - x/3 = 10

MMC = 12

4,3: 2

2,3: 2

1,3: 3

1,1 = 2.2.3 = 12

[3.3x - 4x]/12 = 12.10/12

9x - 4x = 120

5x = 120

x = 120/5

x = 24

c)

2x/10 - 2 = 18

x/5 = 18+2

x/5 = 20

x = 5.20

x = 100