a) -3xy - (2x - y + 2xy) = -3xy - 2x + y - 2xy = -5xy - 2x + y
b) 4ab + (2a - 3ab) = 4ab + 2a - 3ab = ab + 2a
c) -(3p - r) - 2r = -3p + r - 2r = -3p - r
d) -st -(-2t + s) = -st + 2t - s
Poziom B
c) (-3d + 8) * 4 = -12d + 32
d) -3 * (x + 7) = -3x - 21
Poziom C
c) (12p - 9r - 2) : 3 = 4p - 3r - [tex]\frac{2}{3}[/tex]
d) [tex]\frac{4g - 8h + 1}{2}[/tex] = (4g - 8h + 1) : 2 = 2g - 4h + [tex]\frac{1}{2}[/tex]
Poziom D
a) 2(x - 8) - 3(y - [tex]2x^{2}[/tex]) = 2x - 16 - (3y + [tex]6x^{2}[/tex]) = 2x - 16 - 3y - [tex]6x^{2}[/tex]
b)[tex]\frac{9a + 3b}{3} - \frac{4a - 8b}{2} + a = 3a + b - 2a + 4b = 5a + 5b[/tex]
