Continuação ...
8x/3 = 2x-9
x/2 + 3/4 = 1/6
x/2 -7 = x/4 + 5
2x - 1/2 = 5x + 1/3
x - 1 = 5 - x/4
x/6 + x/3 = 18 - x/4
x/4 + x/6 + x/8 = 26
x/8 + x/5 = 17 - x/10
x/4 - x/3 = 2x - 50
5x/2 +7 = 2x + 4
Soluções para a tarefa
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a)
8x/3 = 2x - 9
8x = 2x - 9
-----
3
8x = 3.(2x - 9)
8x = 6x - 27
8x - 6x = - 27
2x = - 27
x = - 27/2
****************************
b)
x/2 + 3/4 = 1/6
x + 3 = 1
----- ----- ------
2 4 6
6x + 9 2
---------- = ------
12 12
6x + 9 = 2
6x = 2 - 9
6x = - 7
x = - 7/6
-----------------------------
c)
x/2 -7 = x/4 + 5
x - 7 = x + 5
----- -----
2 4
2x - 28 x + 20
---------- = ----------
4 4
2x - 28 = x + 20
2x - x = 20 + 28
x = 48
********************************
d)
2x - 1/2 = 5x + 1/3
2x - 1 = 5x + 1
---- -----
2 3
12x - 3 30x + 2
---------- = ------------
6 6
12x - 3 = 30x + 2
- 3 - 2 = 30x - 12x
- 5 = 18x
18x = - 5
x = - 5/18
********************************
e)
x - 1 = 5 - x/4
x - 1 = 5 - x
----
4
4(x - 1) 20 - x
--------- = ---------
4 4
4x - 4 = 20 - x
4x + x = 20 + 4
5x = 24
x = 24/5
*****************************
f)
x/6 + x/3 = 18 - x/4
x + x = 18 - x
----- ----- ----
6 3 4
2x + 4x 216 - 3x
----------- = ---------------
12 12
6x = 216 - 3x
6x + 3x = 216
9x = 216
x = 216/9
x = 24
**********************************
g)
x/4 + x/6 + x/8 = 26
x + x + x = 26
----- ----- -----
4 6 8
6x + 4x + 3x = 624
------------------ --------
24 24
13x = 624
x = 624/13
x = 48
********************************
h)
x/8 + x/5 = 17 - x/10
x + x = 17 - x
----- ---- ------
8 5 10
5x + 8x 680 - 4x
----------- = --------------
40 40
5x + 8x = 680 - 4x
13x = 680 - 4x
13x + 4x = 680
17x = 680
x = 680/17
x = 40
****************************
i)
x/4 - x/3 = 2x - 50
x - x = 2x - 50
---- -----
4 3
3x - 4x 12.(2x - 50)
----------- = ------------------
12 12
3x - 4x = 12.(2x - 50)
- x = 24x - 600
600 = 24x + x
600 = 25x
25x = 600
x = 600/25
x = 24
*****************************
j)
5x/2 + 7 = 2x + 4
5x + 7 = 2x + 4
-----
2
5x + 14 2x + 4
------------ = -----------
2 2
5x + 14 = 2x + 4
5x - 2x = 4 - 14
3x = - 10
x = - 10/3
*********************************
8x/3 = 2x - 9
8x = 2x - 9
-----
3
8x = 3.(2x - 9)
8x = 6x - 27
8x - 6x = - 27
2x = - 27
x = - 27/2
****************************
b)
x/2 + 3/4 = 1/6
x + 3 = 1
----- ----- ------
2 4 6
6x + 9 2
---------- = ------
12 12
6x + 9 = 2
6x = 2 - 9
6x = - 7
x = - 7/6
-----------------------------
c)
x/2 -7 = x/4 + 5
x - 7 = x + 5
----- -----
2 4
2x - 28 x + 20
---------- = ----------
4 4
2x - 28 = x + 20
2x - x = 20 + 28
x = 48
********************************
d)
2x - 1/2 = 5x + 1/3
2x - 1 = 5x + 1
---- -----
2 3
12x - 3 30x + 2
---------- = ------------
6 6
12x - 3 = 30x + 2
- 3 - 2 = 30x - 12x
- 5 = 18x
18x = - 5
x = - 5/18
********************************
e)
x - 1 = 5 - x/4
x - 1 = 5 - x
----
4
4(x - 1) 20 - x
--------- = ---------
4 4
4x - 4 = 20 - x
4x + x = 20 + 4
5x = 24
x = 24/5
*****************************
f)
x/6 + x/3 = 18 - x/4
x + x = 18 - x
----- ----- ----
6 3 4
2x + 4x 216 - 3x
----------- = ---------------
12 12
6x = 216 - 3x
6x + 3x = 216
9x = 216
x = 216/9
x = 24
**********************************
g)
x/4 + x/6 + x/8 = 26
x + x + x = 26
----- ----- -----
4 6 8
6x + 4x + 3x = 624
------------------ --------
24 24
13x = 624
x = 624/13
x = 48
********************************
h)
x/8 + x/5 = 17 - x/10
x + x = 17 - x
----- ---- ------
8 5 10
5x + 8x 680 - 4x
----------- = --------------
40 40
5x + 8x = 680 - 4x
13x = 680 - 4x
13x + 4x = 680
17x = 680
x = 680/17
x = 40
****************************
i)
x/4 - x/3 = 2x - 50
x - x = 2x - 50
---- -----
4 3
3x - 4x 12.(2x - 50)
----------- = ------------------
12 12
3x - 4x = 12.(2x - 50)
- x = 24x - 600
600 = 24x + x
600 = 25x
25x = 600
x = 600/25
x = 24
*****************************
j)
5x/2 + 7 = 2x + 4
5x + 7 = 2x + 4
-----
2
5x + 14 2x + 4
------------ = -----------
2 2
5x + 14 = 2x + 4
5x - 2x = 4 - 14
3x = - 10
x = - 10/3
*********************************
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