Question

Me ajuda por favor !!
a)5x/3 = 10
b)3+4x/12 = 6/3
c)6x/12 = 36/2
d) 2x + 5 = -7
e)3x - 4x + 5 = 6x -7
f)x+2/3 + 3x-3/4 = 1/2

Answer 1

A) 5x/3=10    5x=10.3     x=30/5   x=6
B) 3+4x/12= 6/3      mmc 12 36+4x=24   4x=24-36   x=-12/4  x=-3
C) 6x/12=36/2   mmc 12  6x=216   x=216/6  x=6
D) 2x+5=-7    2x=-7-5   2x=-12  x=-12/2  x=-6
E) 3x-4x+5=6x-7   x-6x=-7-5   -5x=-12 (-1) x=2,4
F) x+2/3 + 3x-3/4 = 1/2 mmc 12   4x+8+ 9x-9 = 12  13x=12+9-8 13x=13 x=1

Answer 2

Olá, boa noite!


Vamos lá :

a) 5x----10
3-------x

5x=10 × 3
5x= 30
x= 30
________
-----5
x= 6

b) 3 + 4x= 6
-------________
--------12----3

mmc-->

12,3 / 2
6 ,3 / 3
2 ,1 / 2
1, 1 ____

2 × 3 ×2 =12


36+4x= 24
4x= 24 - 36
x= -12
______
-----4
x=repeti o sinal = - 3

c)6x----36
12----2

mmc-->

12 , 2 / 2
6 ,1 / 3
2,1 / 2
1, 1 ____
2 ×3 ×2 = 12

36:÷ 2 = 18

6x= 18 × 12
6x= 216
x= 216
______
-----6
x= 6

d) 2x + 5 = -7
obs:mudando o lado muda o sinal .
2x= - 7 - 5
2x= -12
x= -12
______
----2
x= - 6

e) 3x- 4x+ 5 = 6 x - 7
x- 6 x= -7 -5
-5 x = - 12 (-1)
usando - com - = +
x= 2,4


f) x + 2 + 3 x - 3 = 1
--------3----------4---2

mmc= 12

4x+ 8 + 9 x- 9 = 12
13x= 13 + 9 - 8
13x = 13
x= 13
______
----13
x= 1

Espero ter lhe ajudado !