Question

Resolva as seguintes equações do 1º grau:

(a) 3 + x = 0

(b) 23x/4 + 2 = 2/5

(c) 12 – 7/3 + 4x = 25/6

(d) 5x – 3x = 30

(e) 4x/3 + 10/8 = 45/7 – 3x

(f)18x - 43 = 65

(g) 23x - 16 = 14 - 17x

(h) 10y - 5 ∙ (1 + y) = 3 ∙ (2y - 2) - 20​

Answer 1

Resposta:

a) 3+x= 0 - - - > x= 0-3 ou seja, x=-3

b) 23x/4 + 2 = 2/5 - - - > 23x = 2/5 - 2 . 4 = 23x = - 6.4

-6.4 ÷ 23

ou seja, x=−0.2782609

c) 12 – 7/3 + 4x = 25/6 ---> 4x= 25/6 + 7/3 - 12

4x = (25 + 14 / 6) - 12

4x = 6,5 - 12

4x= -5,5

x= −1.375

d) 2x = 30

x = 15

e) 4x + 3x= 45/7 - 10/8 . 3

7x= (360+70/56) . 3

7x = 7.67857143. 3

7x= 23.0357143

x = 3.29081633

f) 18x-43 =65

18x= 65+43

18x = 108

x= 6

g) 23x + 17x = 14 +16

40x= 30

x= 0,75

h) 10y -5 - 5y = 6y - 6 - 20

- 1y=-21

y= 21