Question

Encontre o valor das incógnitas:

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Answer 1

a) x + 47 = 200

x = 200 - 47

x = 153

b)x + 4,25 = 17

x = 17 - 4,25

x = 12,75

c) A - 40 = 520

A = 520 + 40

A = 560

d) A - 7,5 = 36

A = 36 + 7,5

A = 43,5

e) - 4x = - 320

x = - 320/ -4

x = 80

f) - 6y = 1800

y = 1800/-6

y = - 300

g) B/8 = 46

B = 46.8

B = 368

h)

x/2 + x/4 = 180

MMC = 4

2x/4 + x/4 = 720/4

2x + x = 720

3x = 720

x = 720/3

x = 240

i) 2 (-2x + 30) = -6x + 360

- 4x + 60 = - 6x + 360

- 4x + 6x = 360 - 60

2x = 300

x = 150

j)

- 2,5x - 115 = - 0,7x + 360

- 2,5x + 0,7x = 360 + 115

- 1,8x = 475

x = 475/- 1,8

x = - 263,88

k) x2 = 289

x = ±∛289

x = ±17