a) 4x-5=12-5x
b) 4(x-5)=3(x-2)
c) 3n+11=2(n-7)
d) 3(x-14=7(x-18)
e) 9x-3-4x=9x-7+x
f) 6(5x-2)-5(6x-5)=4(9-2x)+1
g) x/2+x/3=10
h) x/3+1/6=x/2
i) 3x-1/4-4x-1/3=0
j) 3.(x-1)-2.(x+3)+5.(2-x)=-7
l) 3.(2-4.(x-1)-3)+2.(x-1)=0
m) 1-(2-x)/3=x+4/5
por favor preciso muito dessas respostas
moreninhaflorb:
voce aida vai me ajudar ?
h) x/3+1/6=x/2
i) 3x-1/4-4x-1/3=0
j) 3.(x-1)-2.(x+3)+5.(2-x)=-7
Respostas
respondido por:
1
A 4x+5x=12+5
9x=17
x=9/17
x=
B= 4(x-5) = 3(x-2)
4x-20= 3x - 6
4x+3x= -6 + 20
7x = 14
x = 14/7
x=2
C 3n+11 = 2(n-7)
3n + 2n = 14 - 11
5n = 5
x= 5/5
x= 1
D 3(x-14=7(x-18)
3x-42=7x-126
3x-7x= -126 +42
-4x = 84
x=4/84
x= 21
E 9x-3-4x=9x-7+x
9x-4x-9x-x = -7 + 3
5x -9x - x = 7+ 3
-4x - x = 7 + 3
5x = 10
x=10/5
x= 5
F 6(5x-2) - 5(6x-5)=4(9-2x) + 1
30x - 12 - 30x- 25= 36-8x +1
30x + 30x+8x = 1 +25 +12
60x + 8x = 26 + 12
68x = 38
x = 68/38
x=1.7
PS = alguns sinais podem estar incorretos , favor conferir . Não tenho especialidade nas ultimas questões . Espero ter ajudado
9x=17
x=9/17
x=
B= 4(x-5) = 3(x-2)
4x-20= 3x - 6
4x+3x= -6 + 20
7x = 14
x = 14/7
x=2
C 3n+11 = 2(n-7)
3n + 2n = 14 - 11
5n = 5
x= 5/5
x= 1
D 3(x-14=7(x-18)
3x-42=7x-126
3x-7x= -126 +42
-4x = 84
x=4/84
x= 21
E 9x-3-4x=9x-7+x
9x-4x-9x-x = -7 + 3
5x -9x - x = 7+ 3
-4x - x = 7 + 3
5x = 10
x=10/5
x= 5
F 6(5x-2) - 5(6x-5)=4(9-2x) + 1
30x - 12 - 30x- 25= 36-8x +1
30x + 30x+8x = 1 +25 +12
60x + 8x = 26 + 12
68x = 38
x = 68/38
x=1.7
PS = alguns sinais podem estar incorretos , favor conferir . Não tenho especialidade nas ultimas questões . Espero ter ajudado
respondido por:
1
a)
4x - 5 = 12 - 5x
4x + 5x = 12 + 5
9x = 17
x = 17/9
==================
b)
4.(x - 5) = 3.(x - 2)
4x - 20 = 3x - 6
4x - 3x = - 6 + 20
x = 14
===================
c)
3n + 11 = 2.(n - 7)
3n + 11 = 2n - 14
3n - 2n = -14 -11
n = - 25
**********************************
d)
3.(x - 14) = 7.(x - 18)
3x - 42 = 7x - 126
- 42 + 126 = 7x - 3x
84 = 4x
4x = 84
x = 84/4
x = 21
==================
e)
9x - 3 - 4x = 9x - 7 + x
- 3 - 4x = - 7 + x
- 3 + 7 = x + 4x
4 = 5x
5x = 4
x = 4/5
==============
f)
6.(5x - 2) - 5.(6x - 5) = 4.(9 - 2x) + 1
30x - 12 - 30x + 25 = 36 - 8x + 1
- 12 + 25 = 36 + 1 - 8x
13 = 37 - 8x
8x = 37 - 13
8x = 24
x = 24/8
x = 3
=======================
g)
x/2+x/3=10
x x
--- + ----- = 10
2 3
3x + 2x 60
---------- = ------
6 6
3x + 2x = 60
5x = 60
x = 60/5
x = 12
---------------------------------------
h)
x/3+1/6=x/2
x 1 x
--- + ---- = -----
3 6 2
2x + 1 = 3x
--------- -----
6 6
2x + 1 = 3x
1 = 3x - 2x
1 = x
x = 1
----------------------------------------------------------
i)
3x-1/4 - 4x-1/3=0
3x - 1 - 4x - 1
-------- --------- = 0
4 3
3(3x - 1) - 4.(4x - 1) = 0
------------------------- -----
12 12
9x - 3 - 16x + 4 = 0
- 7x + 1 = 0
1 = 7x
7x = 1
x = 1/7
==============================
j)
3.(x - 1) - 2.(x + 3) + 5.(2 - x) = - 7
3x - 3 - 2x - 6 + 10 - 5x = - 7
3x - 2x - 5x - 3 - 6 + 10 = - 7
x - 5x - 9 + 10 = - 7
- 4x + 1 = - 7
1 + 7 = 4x
8 = 4x
4x = 8
x = 8/4
x = 2
============================
m)
1 - (2-x)/3=x + 4/5
1 - (2 - x) x + 4
---------- = --------
3 5
mmc (3,5) = 15
15 - 5(2 - x) = 3(x + 4)
--------------- -----------
15 15
15 - 10 + 5x = 3x + 12
5 + 5x = 3x + 12
5x - 3x = 12 - 5
2x = 7
x = 7/2
===============
l)
3.(2 - 4).(x-1) - 3 +2.(x - 1) = 0
3.(-2).(x - 1) - 3 + 2x - 2 = 0
- 6.(x - 1) - 3 - 2 + 2x = 0
- 6x + 6 - 5 + 2x = 0
- 4x + 1 = 0
1 = 4x
4x = 1
x = 1/4
4x - 5 = 12 - 5x
4x + 5x = 12 + 5
9x = 17
x = 17/9
==================
b)
4.(x - 5) = 3.(x - 2)
4x - 20 = 3x - 6
4x - 3x = - 6 + 20
x = 14
===================
c)
3n + 11 = 2.(n - 7)
3n + 11 = 2n - 14
3n - 2n = -14 -11
n = - 25
**********************************
d)
3.(x - 14) = 7.(x - 18)
3x - 42 = 7x - 126
- 42 + 126 = 7x - 3x
84 = 4x
4x = 84
x = 84/4
x = 21
==================
e)
9x - 3 - 4x = 9x - 7 + x
- 3 - 4x = - 7 + x
- 3 + 7 = x + 4x
4 = 5x
5x = 4
x = 4/5
==============
f)
6.(5x - 2) - 5.(6x - 5) = 4.(9 - 2x) + 1
30x - 12 - 30x + 25 = 36 - 8x + 1
- 12 + 25 = 36 + 1 - 8x
13 = 37 - 8x
8x = 37 - 13
8x = 24
x = 24/8
x = 3
=======================
g)
x/2+x/3=10
x x
--- + ----- = 10
2 3
3x + 2x 60
---------- = ------
6 6
3x + 2x = 60
5x = 60
x = 60/5
x = 12
---------------------------------------
h)
x/3+1/6=x/2
x 1 x
--- + ---- = -----
3 6 2
2x + 1 = 3x
--------- -----
6 6
2x + 1 = 3x
1 = 3x - 2x
1 = x
x = 1
----------------------------------------------------------
i)
3x-1/4 - 4x-1/3=0
3x - 1 - 4x - 1
-------- --------- = 0
4 3
3(3x - 1) - 4.(4x - 1) = 0
------------------------- -----
12 12
9x - 3 - 16x + 4 = 0
- 7x + 1 = 0
1 = 7x
7x = 1
x = 1/7
==============================
j)
3.(x - 1) - 2.(x + 3) + 5.(2 - x) = - 7
3x - 3 - 2x - 6 + 10 - 5x = - 7
3x - 2x - 5x - 3 - 6 + 10 = - 7
x - 5x - 9 + 10 = - 7
- 4x + 1 = - 7
1 + 7 = 4x
8 = 4x
4x = 8
x = 8/4
x = 2
============================
m)
1 - (2-x)/3=x + 4/5
1 - (2 - x) x + 4
---------- = --------
3 5
mmc (3,5) = 15
15 - 5(2 - x) = 3(x + 4)
--------------- -----------
15 15
15 - 10 + 5x = 3x + 12
5 + 5x = 3x + 12
5x - 3x = 12 - 5
2x = 7
x = 7/2
===============
l)
3.(2 - 4).(x-1) - 3 +2.(x - 1) = 0
3.(-2).(x - 1) - 3 + 2x - 2 = 0
- 6.(x - 1) - 3 - 2 + 2x = 0
- 6x + 6 - 5 + 2x = 0
- 4x + 1 = 0
1 = 4x
4x = 1
x = 1/4
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