Question

1-Resolva as questões:
a)20×-4=5×
b)4×=-8×+36
c)4(×-3)=2×-5
d)5(1-×)-2×+1=-3(2+×)
e)6×+5=41
f)12×=144

Gente me ajude vale 5 pontos

Answer 1

Olá!!!

a)
20x - 4 = 5x
20x - 5x = 4
15x = 4
x = 4/15

b)
4x = 8x + 36
4x - 8x = 36
- 4x = 36
x = 36 / - 4
x = - 9

c)
4 ( x - 3 ) = 2x - 5
4x - 12 = 2x - 5
4x - 2x = - 5 + 12
2x = 7
x = 7 / 2
x = 3,5

d)
5 ( 1 - x ) - 2x + 1 = - 3 ( 2 + x )
5 - 5x - 2x + 1 = - 6 + 3x
- 5x - 2x - 3x = - 6 - 5 - 1
- 10x = - 12
x = - 12 / - 10 simpl. (:2) = 6 / 5

e)
6x + 5 = 41
6x = 41 - 5
6x = 36
x = 36 / 6
x = 6

f)
12x = 144
x = 144 / 12
x = 12

Espero ter ajudado....