zad. 1.
a) 5 - 6x = 3(x +1)
5 - 6x = 3x + 3
-6x - 3x = -5 + 3
-9x = -2 | : (-9)
x = 2/9
b) 1/2x + 5/6 = 2 - 3/4x
1/2x + 3/4x = 2 - 5/6
5/4x = 1 1/6 | : 1 1/4
x = 7/6 * 4/5
x = 28/30
x = 14/15
c) -x + 4(x - 1) = -1 - 6x
-x + 4x - 4 = -1 - 6x
3x + 6x = -1 + 4
9x = 3 | : 9
x = 3/1 * 1/9
x = 3/9
x = 1/3
d) 1 1/2x - 2 = -0,5(5 - 3x)
1 1/2x - 2 = -2,5 + 1,5x
1 1/2x - 1,5x = -2,5 + 2
0 = 0,5
odp C
zad. 2
2(x -3) + 1 = 3x - 4 - (x + 2)
2x - 6 + 1 = 3x - 4 - x - 2
2x - 5 = 2x - 6
2x - 2x = -6 + 5
0 = -1
odp A
zad. 3
a) 7 - 2x = 5 - 1/4x
-2x + 1/4x = 5 - 7
- 1 3/4x = -2 | : (- 7/4)
x = 2 * 4/7
x = 8/7
b) 7 - 2x = 0,5(x - 6)
7 - 2x = 0,5x - 3
-2x - 0,5x = -3 - 7
-2,5x = -10 | : (-2,5)
x = 4
c) 7 - 2x = -5(x - 3)
7 - 2x = -5x + 15
-2x + 5x = 15 - 7
3x = 8 | : 3
x = 8/3 ( = 2 2/3)
d) 7 - 2x = 1 - (x + 2)
7 - 2x = 1 - x - 2
-2x + x = 1 - 2 - 7
-x = -8 | : (-1)
x = 8
Odp.: B
zad. 4
a) 6x - 1 = -2x + 3
6 + 2x = 3 + 1
8x = 4 | : 8
x = 0,5
odp. A
