Odpowiedź :
Odpowiedź:
7.
b)
- 6x + 8 = 4
- 6x = 4 - 8
- 6x = - 4 / : (-6)
x = 4/6
x = 2/3
c)
5x - 14 = 6
5x = 6 + 14
5x = 20 / : 5
x = 4
d)
9 - x = 24
- x = 24 - 9
- x = 15 / * (-1)
x = - 15
e)
5 + 4x = 29
4x = 29 - 5
4x = 24 / : 4
x = 6
f)
1/5x - 2 = 4
1/5x = 4 + 2
1/5x = 6 / * 5
x = 30
8.
a)
2x = 2 / : 2
x = 1
b)
x + 1 = 2
x = 2 - 1
x = 1
c)
- x + 8 = 0
- x = - 8 / * (-1)
x = 8
d)
62 + 3x = 32
3x = 32 - 62
3x = - 30 / : (-3)
x = 10
e)
2y - 3 = 5
2y = 5 + 3
2y = 8 / : 2
y = 4
f)
- 1/2z + 1 = -4
- 1/2z = -4 - 1
- 1/2z = -5 / * (-2)
z = 10
Szczegółowe wyjaśnienie:
z7
b) -6x + 8 = 4 /-8
-6x = -4 /: (-6)
x = [tex]\frac{4}{6}[/tex]
c) 5x - 14 = 6 /+14
5x = 20 /:5
x = 4
d) 9 - x = 24 /-9
-x = 15 /: (-1)
x = -15
e) 5 + 4x = 29 /-5
4x = 24 /:4
x = 6
f) [tex]\frac{1}{5}[/tex]x - 2 = 4 /+2
[tex]\frac{1}{5}[/tex]x = 6 /·5
x = 30
z8
a) 4x - 6x = 2
-2x = 2 /: (-2)
x = -1
b) 5x - 4x + 1 = 2
x + 1 = 2 /-1
x = 1
c) 6x + 8 - 7x = 0
-x + 8 = 0 /-8
-x = -8 /:(-1)
x = 8
d) 62 + 5x - 2x = 32
62 + 3x = 32 /-62
3x = -30 /:3
x = -10
e) y - 3 + y = 5
2y - 3 = 5 /+3
2y = 8 /:2
y = 4
f) [tex]\frac{1}{2}[/tex]z + 1 - z = -4
-[tex]\frac{1}{2}[/tex]z + 1 = -4 /-1
-[tex]\frac{1}{2}[/tex]z = -5 /·(-2)
z = 10