Question

Przedstaw w postaci iloczynu.

a (x+y)razy a+(x+y)razy b=
b 3(z-y)-a(z-y)=
c (m-1)(k-1)+(k-1)(m+1)=
d (a-1)(b+c)-(a-1)(b-c)=

Answer 1

A]
(x+y)a+(x+y)b=(x+y)(a+b)
b]
3(z-y)-a(z-y)=(3-a)(z-y)
c]
(m-1)(k-1)+(k-1)(m+1)=(k-1)(m-1+m+1)=(k-1)2m
d]
(a-1)(b+c)-(a-1)(b-c)=(a-1)[b+c-(b-c)]=(a-1)(b+c-b+c)=(a-1)2c