Question

a)x/5-15=1 b)2a/6+5/7=5a/4 c)x+4/4-2x+1/3=4 Preciso urgente

Answer 1

Oie, Td Bom?!

a)

x/5 - 15 = 1

5(x/5 - 15) = 5 . 1

5 . x/5 - 5 . 15 = 5

x - 75 = 5

x = 5 + 75

x = 80

b)

2a/6 + 5/7 = 5a/4

84(2a/6 + 5/7) = 84 . 5a/4

84 . 2a/6 + 84 . 5/7 = 21 . 5a

14 . 2a + 12 . 5 = 105a

28a + 60 = 105a

28a - 105a = - 60

- 77a = - 60

a = -60/-77

a = 60/77

c)

[x + 4]/4 - [2x + 1]/3 = 4

12([x + 4]/4 - [2x + 1]/3) = 12 . 4

12 . [x + 4]/4 - 12 . [2x + 1]/3 = 48

3(x + 4) - 4(2x + 1) = 48

3x + 12 - 8x - 4 = 48

- 5x + 8 = 48

- 5x = 48 - 8

- 5x = 40

x = 40/-5

x = - 8

Att. Makaveli1996