Odpowiedź :
a)(2a-b)*(a-7b)*(5-c)=2a-b*a-7b*5-c=2a²-8b*5-c
b) (a-3)*(b-1)*(c-8)=a-3*b-1*c-8=24abc
b) (a-3)*(b-1)*(c-8)=a-3*b-1*c-8=24abc
a)= 2a2-14ab-ab+7b2+5a-ac-35b+7bc=2a2-15ab+7b2+5a-ac-35b
b)= ab-a-3b+3+bc-8b-c+8=ab-a-11b+bc-c+11
c)= (-a+1)*(c-2)*(b+3)= -ac+2a+c-2+bc+3c-2b-6=-ac+2a+bc+4c-2b-8
d)= (yz-2z)*(3x-1)*(y-4)=3xyz-yz-6xz+2z+3xy-12x-y+4
b)= ab-a-3b+3+bc-8b-c+8=ab-a-11b+bc-c+11
c)= (-a+1)*(c-2)*(b+3)= -ac+2a+c-2+bc+3c-2b-6=-ac+2a+bc+4c-2b-8
d)= (yz-2z)*(3x-1)*(y-4)=3xyz-yz-6xz+2z+3xy-12x-y+4