Question

Resolva as equações de 1 primeiro grau e mostre como chegou a esse resultado

a)6x=2x+16

b)4x-10=2x+2

c)7.(x-2)=5(x+3)

d)2(x-5)+4(x-1)=0

e)x/2-x/4=1/2

f)x/4+7=2/2+5

g)x/3+x/2=7+x/0

h)x-2/3+2x=5x/2

i)x-5/+3x-1/2=4

Answer 1

Resposta:

a) 6x = 2x +16

6x - 2x = 16

4x = 16

x = 16/4

x = 4

b) 4x-10=2x+2

4x-2x = 2 + 10

2x = 12  

x = 12/2

x = 6

c) 7( x - 2) = 5(x + 3)

7x - 14 = 5x + 15

7x - 5x = 15 + 14

2x = 29

x = 29/2

d) 2(x-5) + 4(x-1) = 0  

2.x - 2.5 + 4.x - 4.1 = 0  

2x - 10 + 4x - 4 = 0  

6x - 14 = 0  

6x = 14  

x = 14/6  

x = 7/3

e) x/2 - x/4 = 1/2

m.m.c = 4

2 x/4 - x/4 = 2/4 cortar o denominador

2 x - x = 2

x = 2

f) x + 28 = 2x + 20

x - 2x = 20 - 28

-x = - 8 .(-1)

x = 8  

g)  3x²+7x=0

x(3x + 7)=0  

x = 0 ou  3x + 7 = 0

               3x=-7

                x= -7/3

h) 2x - 4 + 12x = 15x

14x - 4 = 15x

- 4 = 15x - 14x

- 4 = x

x = - 4

i) (x-5)/3 + (3x-1)/2 = 4

(2x-10)/6 + (9x-3)/6 = 24/6

2x-10+9x-3=24

11x=37

x=37/11