Zad. 2.
(3x+4) - (3x-4) = 3x + 4 - 3x + 4 = 4 + 4 = 8
Odp. B
Zad. 3.
a) (4x - 2) - (3x + 4) = 4x - 2 - 3x - 4 = x - 6
b) - 2x - (4 - x) + 2 = - 2x - 4 + x + 2 = - x -2
c) (2a - 4) + (2a + 4) = 2a - 4 + 2a + 4 = 4a
Zad. 4.
a) (3x - 16y) : 4 = 3/4 x - 4y =/= 3x - 4y
b) (9x - 16y) : 4 = 9/4 x - 4y =/= 3x - 4y
c) (12x - 9y) : 3 = 4x - 3y =/= 3x - 4y
d) (9x - 12y) : 3 = 3x - 4y == 3x - 4y
Odp. d.
Zad. 5.
a) 12a - (5a + 3) + 7 * (2 - a) = 12a - 5a - 3 + 14 - 7a = 11
b) 4 * (x - y) - 3y - 2 * (y - x) + x = 4x - 4y - 3y - 2y + 2x + x = 7x - 9y
