Odpowiedź:
Poziom B
a)
3x - 8 = 2x + 4
3x - 2x = 4 + 8
x = 12
b)
5x - 3 = 4x + 6
5x - 4x = 6 + 3
x = 9
c)
7x - 9 = 6x - 8
7x - 6x = -8 + 9
x = 1
Poziom C
a) 4x - 3(3x - 5) = 6x + 4
4x - 9x + 15 = 6x + 4
-5x + 15 = 6x + 4
-5x - 6x = 4 - 15
-11x = -11
x=1
b) 8 - (4x - 12) = 8x - (3x - 2)
8 - 4x + 12 = 8x - 3x + 2
20 4x = 5x + 2
-4x - 5x = 2 - 20
-9x = -18
x = 2
c)5/4 * (1 - x) - 1/4 = 3/4 * (x - 4) + 3
5/4 - 5/4 * x - 1/4 = 3/4 * x - 3 + 3
1 - 5/4 * x = 3/4 * x
4 - 5x = 3x
- 5x - 3x = - 4
- 8x = - 4
x = 1/2
Proszę o naj i mam nadzieje że pomogłam
