tem que der calculos pfv
1
a) 2.(x + 3) = 16
b) 3.(x - 5) = 6
c) 5.(2x - 1) = 8x + 3
d) 6.(x + 10) = 0
e) 2(3 - x) = 12
f) -2.(x + 4) = 6 – 4x
2
a) 4x + 10 = – 8 + x
b) 3x – 7 = 15 + x
c) 2m + m – 6 = m + 12
d) 15 – x = 4 – 2x
e) 5x + 2 – 3x = 16
f) 9 – 3x + 1 = 12 + x + 2
g) –6 + x = – 2 – x
h) 6x – 2x = 10 + 4 + x
i) 8x + 3 = 21 + 5x
j) 5 + 2x – 6 = 22
Soluções para a tarefa
Resposta:
1)
a- 2.(x+3) = 16
2x + 6 = 16
2x = 16 - 6
2x = 10
x = 10 / 2
x = 5
b- 3.(x-5) = 6
3x - 15 = 6
3x = 6 + 15
3x = 21
x = 21 / 3
x = 7
c- 5.(2x-1) = 8x + 3
10x - 5 = 8x + 3
10x - 8x = 3 + 5
2x = 8
x = 8/2
x = 4
d- 6.(x+10) = 0
6x + 10 = 0
6x = 0 - 10
6x = -10
x = -10/6 (÷2)
x = -5/3
e- 2.(3-x) = 12
6 - 2x = 12
-2x = 12 - 6
-2x = 6 . (-1)
2x = -6
x = -6/2
x = -3
f- -2.(x+4) = 6 - 4x
-2x -8 = 6 -4x
-2x +4x = 6+8
2x = 14
x = 14/2
x = 7
2)
a- 4x + 10 = -8 + x
4x - x = -8 -10
3x = -18
x = -18/3
x = -6
b- 3x -7 = 15 + x
3x - x = 15 + 7
2x = 22
x = 22/2
x = 11
c- 2m + m - 6 = m + 12
2m + m - m = 12 + 6
2m = 18
m = 18/2
m = 9
d- 15-x = 4-2x
-x+2x = 4-15
x = -11
e- 5x + 2 - 3x = 16
5x -3x = 16 - 2
2x = 14
x = 14/2
x = 7
f- 9 -3x + 1 = 12 + x + 2
-3x-x = 12 + 2 -1 -9
-4x = 4 . (-1)
4x = 4
x = 4/4
x = 1
g- -6 + x = - 2 - x
x + x = - 2 + 6
2x = 4
x = 4/2
x = 2
h- 6x - 2x = 10 + 4 + x
6x - 2x - x = 10 + 4
6x - 3x = 14
3x = 14
x = 14/3
i- 8x + 3 = 21 + 5x
8x - 5x = 21 - 3
3x = 18
x = 18/3
x = 6
j- 5 + 2x - 6 = 22
2x = 22 - 5 + 6
2x = 23
x = 23/2
Resposta:
1:a) 2. (X +3) = 16=
2. (X +3) = 16
2x + 6 = 16
2x + 6 - 6 = 16 - 6
2x = 10
2x = 10
2 2
X = 5
B) 3.(x - 5) = 6=
3. (X - 5) = 6
3x - 15 = 6
3x - 15 + 15 = 6 + 15
3x = 21
3x = 21
3 3
X = 7
C) 5.(2x - 1) = 8x + 3
5. (2x - 1) = 8x + 3=
10x - 5 = 8x + 3=
10x - 5 + 5 = 8x + 3 + 5=
10x = 8x + 8=
10x - 8x = 8x + 8 - 8x=
2x = 8
2x = 8
2 2
X = 4
D) 6.(x + 10) = 0
6.(x + 10) = 0=
6x + 60 = 0=
6x + 60 - 60 = 0 - 60=
6x = -60
6x = -60
6 6
X = -10
E) 2(3 - x) = 12
2(3 - x) = 12 =
2. (- x + 3) = 12 =
-2x + 6 = 12 =
-2x + 6 - 6 = 12 - 6=
-2x = 6
-2x = 6
-2 -2
X = - 3