Question

determine a raiz de cada equação a seghir (resolva descobrindo o valor do trempo X desconhecido)



p) 5.(3x-2)=2.(6x+3 s) 2.(3-y)+7.(2-y)=15-4y v)x-(x+1)=12-(3x-2)


q)2.(3x-1) +2.(3-x) t)2.(x-2)+5.(2-x)+6.(x+1)= 0



r) 7.(x-1)=2.(3x+1) u) 3.(x-2)-(1-x)=13

Answer 1

Olá,

Vamos lá,

p) 5.(3x-2)=2.(6x+3) 
15x - 10 = 12x + 6
15x - 12x = 6 + 10
3x = 16
x = 16/3

s) 2.(3-y)+7.(2-y)=15-4y
6 - 2y + 14 - 7y = 15 - 4y
-2y - 7y + 4y = 15 - 6 -14
-5y = -5    
y = 5/5
y = 1

v)x-(x+1)=12-(3x-2)
x -x -1 = 12 -3x + 2
x -x + 3x = 12 -2+1
3x = 11
x = 11/3

q)2.(3x-1) +2.(3-x) = 0
6x - 2 + 6 - 2x = 0
4x = -6 +2
4x = -4
x = -4/4
x= -1

t)2.(x-2)+5.(2-x)+6.(x+1)= 0
2x - 4 + 10 -5x + 6x + 6 = 0
3x = 4 -10 - 6
3x = -12
x = -12/3
x = - 4

r) 7.(x-1)=2.(3x+1)
7x - 7 = 6x +2
7x - 6x = 2 + 7
x = 9


u) 3.(x-2)-(1-x)=13
3x - 6 - 1 +x = 13
4x = 13 + 6 +1
4x = 20
x = 20/4
x = 5