Odpowiedź:
8a + (5a-8)= 8a + 5a + 8 = 13a + 8
-2x + 8y - (6x – 7y)= -2x + 8y - 6x + 7 = -8x + 8y + 7
13a - (5a + 3) + 7(4- a) = 13a - 5a - 3 + 28 - 7a= a + 25
4 (x-y)- 3y - 2y(y-x)+x= 4x - 4y - 3y - 2y^2 - 2x +x = 3x - 4y - 3y - 2y^2
3x2 + 2x* (-3x) + 4x^2 + 15x :3 = -3x^2
2a - (7b-4a) = 2a - 7b + 4a = 6a + 7b
