a)
4 · x + 1 = 25
4x + 1 = 25
4x = 25 - 1
4x = 24 | : 4
x = 6
sprawdzenie:
L = 4 · 6 + 1 = 24 + 1 = 25
P = 25
L = P
b)
16 + 2 · x = 18
16 + 2x = 18
2x = 18 - 16
2x = 2 | : 2
x = 1
sprawdzenie:
L = 16 + 2 · 1 = 16 + 2 = 18
P = 18
L = P
c)
9 + 3 · x = 15
9 + 3x = 15
3x = 15 - 9
3x = 6 | : 3
x = 2
sprawdzenie:
L = 9 + 3 · 2 = 9 + 6 = 15
P = 15
L = P
d)
5 · x - 6 = 9
5x - 6 = 9
5x = 9 + 6
5x = 15 | : 5
x = 3
sprawdzenie:
L = 5 · 3 - 6 = 15 - 6 = 9
P = 9
L = P
e)
2 · x + 5 = -9
2x + 5 = -9
2x = -9 - 5
2x = -14 | : 2
x = -7
sprawdzenie:
L = 2 · (-7) + 5 = -14 + 5 = -9
P = -9
L = P
f)
23 + 4 · x = 7
23 + 4x = 7
4x = 7 - 23
4x = -16 | : 4
x = -4
sprawdzenie:
L = 23 + 4 · (-4) = 23 - 16 = 7
P = 7
L = P
Odpowiedź:
4 * x + 1 = 25
4x = 25 - 1
4x = 24 /:4
x = 6
spr
4 * 6 + 1 = 24 + 1 = 25
9 + 3 * x = 15
3x = 15 - 9
3x = 6 /:3
x = 2
spr
9 + 3 * 2 = 9 + 6 = 15
16 + 2 * x = 18
2x = 18 - 16
2x = 1 /:2
x = 1
spr
16 + 2 * 1 = 16 + 2 = 18
5 * x - 6 = 9
5x = 9 + 6
5x = 15 /:5
x = 3
spr
5 * 3 - 6 = 15 - 6 = 9
2 * x + 5 = -9
2x = -9 - 5
2x = -14 /:2
x = -7
spr
2 * (-7) + 5 = -14 + 5 = -9
23 - 4 * x = 7
4x = 23 - 7
4x = 16 /:4
x = 4
spr
23 - 4 * 4 = 7 = 23 - 16 = 7