Question

Resolver as equações abaixo, sendo U=R. a) 2x + 1 = 9 b) 3x + 5 = 20 c) 4x = 16 d) 5x = 20 e) 6x = 30 f) 9x – 1 = 80 g) 18x – 2 = 160 h) 4x – 3 = 2x + 12 i) 7x – 4 = 17 j) 40x + 20 = - 60 k) 5 + 2x = 13 l) 22x – 44 = 12x + 16

Answer 1

U = R : Universo igual ao conjunto dos números reais

a) 2x + 1 = 9

2x = 9 - 1

2x = 8

X= 8/2

Resp: x = 4

b) 3x + 5 = 20

3x = 20 - 5

3x = 15

x= 15/3

Resp: x = 5

c) 4x = 16

x = 16/4

Resp: x = 4

d) 5x = 20

x = 20/5

Resp: x=4

e) 6x = 30

x = 30/6

Resp: x = 5

f) 9x – 1 = 80

9x = 80 + 1

9x = 81

Resp: x = 9

g) 18x – 2 = 160

18x = 160 + 2

18x = 162

x= 162/18

Resp: x= 9

h) 4x – 3 = 2x + 12

4x - 2x = 12 + 3

2x = 15

x= 15/2

Resp: x = 7.5

i) 7x – 4 = 17

7x = 17 + 4

7x = 21

x= 21/7

Resp: 3

j) 40x + 20 = - 60

40x = -60 - 20

40x = - 80

x= -80/ 40

Resp: X = -2

k) 5 + 2x = 13

2x = 13 - 5

2x = 8

x = 8 ÷ 2

Resp: x = 4

l) 22x – 44 = 12x + 16

22x - 12x = 16 + 44

10x = 60

x = 60/ 10

Resp: X = 6

(espero ter ajudado <3)