Resposta:
1.
x 6
------ = ------
5 10 multiplique cruzado
x . 10 = 5 . 6
10x = 30
x = 30/10
x = 3
...
2.
3 60
7 x multiplique cruzado
3 . x = 7 . 60
3x = 420
x = 420/3
x = 140
3.
2x 8
3 6 multiplique cruzado
2x . 6 = 3 . 8
12x = 24
x = 24/12
x = 2
4.
6 3x
2 28 multiplique cruzado
2 . 3x = 6 . 28
6x = 168
x = 168/6
x = 28
..
5.
x -2 x
12 20 multiplique cruzado
12 . x = 20 (x - 2)
12x = 20x - 40
12x -20x = -40
-8x = -40
x = -40/-8
x = +5
6.
x +1 x
5 3 multiplique cruzado
5 . x = 3 (x + 1)
5x = 3x + 3
5x -3x = 3
2x = 3
x = 3/2
x = 1,5
7.
x x +2
6 10 multiplique cruzado
x . 10 = 6 (x +2)
10x = 6x + 12
10x -6x = 12
4x = 12
x = 12/4
8.
3 x +3
------ = -------
2 x - 1 multiplique cruzado
2 (x +3) = 3 (x -1)
2x +6 = 3x -3
2x -3x = -3 -6
-x = -9 ( - )
x = +9
9.
5 +x 3
------- = ------
8 +x 4 multiplique cruzado
3 (8 + x) = 4 (5 + x)
24 + 2x = 20 + 4x
2x -4x = 20 -24
-2x = -4
x = -4/-2
x = +2
Explicação passo a passo:
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Resposta:
1.
x 6
------ = ------
5 10 multiplique cruzado
x . 10 = 5 . 6
10x = 30
x = 30/10
x = 3
...
2.
3 60
------ = ------
7 x multiplique cruzado
3 . x = 7 . 60
3x = 420
x = 420/3
x = 140
...
3.
2x 8
------ = ------
3 6 multiplique cruzado
2x . 6 = 3 . 8
12x = 24
x = 24/12
x = 2
...
4.
6 3x
------ = ------
2 28 multiplique cruzado
2 . 3x = 6 . 28
6x = 168
x = 168/6
x = 28
..
5.
x -2 x
------ = ------
12 20 multiplique cruzado
12 . x = 20 (x - 2)
12x = 20x - 40
12x -20x = -40
-8x = -40
x = -40/-8
x = +5
...
6.
x +1 x
------ = ------
5 3 multiplique cruzado
5 . x = 3 (x + 1)
5x = 3x + 3
5x -3x = 3
2x = 3
x = 3/2
x = 1,5
...
7.
x x +2
------ = ------
6 10 multiplique cruzado
x . 10 = 6 (x +2)
10x = 6x + 12
10x -6x = 12
4x = 12
x = 12/4
x = 3
...
8.
3 x +3
------ = -------
2 x - 1 multiplique cruzado
2 (x +3) = 3 (x -1)
2x +6 = 3x -3
2x -3x = -3 -6
-x = -9 ( - )
x = +9
...
9.
5 +x 3
------- = ------
8 +x 4 multiplique cruzado
3 (8 + x) = 4 (5 + x)
24 + 2x = 20 + 4x
2x -4x = 20 -24
-2x = -4
x = -4/-2
x = +2
Explicação passo a passo: