Odpowiedź:
a)
3x = 9 /: 3
x = 3
Sprawdzenie:
3 • 3 = 9
9 = 9
L = P
b)
2x + 4 = 6
2x = 6 - 4
2x = 2 /: 2
x = 1
Sprawdzenie:
2 • 1 + 4 = 6
2 + 4 = 6
6 = 6
L = P
c)
3x - 1 = 5
3x = 5 + 1
3x = 6 /: 3
x = 2
Sprawdzenie:
3 • 2 - 1 = 5
6 - 1 = 5
5 = 5
L = P
d)
9x - 3 = 2x + 5
9x - 2x = 5 + 3
7x = 8 /: 7
x = 8/7
x = 1 i 1/7
Sprawdzenie;
9 • 1 i 1/7 - 3 = 2 • 1 i 1/7 + 5
9 • 8/7 - 3 = 2 • 8/7 + 5
72/7 - 21/7 = 16/7 + 35/7
51/7 = 51/7
7 i 2/7 = 7 i 2/7
L = P
