Odpowiedź:
Szczegółowe wyjaśnienie:
a) [tex]8xy-2x-4y-12xy-7+7y-6x = -4xy - 8x +3y - 7[/tex]
b) [tex]= -60x+24y+18-14y-5x+4=-65x+10y+22[/tex]
c)[tex]= 20xy - 10x^{2} -4y^{2} -2xy=18xy- 10x^{2} -4y^{2}[/tex]
d) [tex]=-7( 36xy-4x^{2} -9y^{2} +xy) = -7( 37xy-4x^{2} -9y^{2}) = -259xy+28x^{2} +63y^{2}[/tex]
e) = [tex]=(20x-10-4x^{2}+2x) (3-3x) = (22x-10-4x^{2}) (3-3x) = 66x-30-12x^{2} -66x+30+12x^{3} =-12x^{2} +12x^{3}[/tex]
