Question

helpppppp !!!Va rog.

Answer 1

d) x+y=3a+2b+2a+3b=5a+5b=5*(a+b)
x-y=3a+2b-2a+3b=a-b
(x+y)*(x-y)=5*(a+b)(a-b) care se divide cu (a+b)*(a-b)
c)x=3a+8b+5c,y=6a+b+4c
x+y=9a+9c+9b=>9divide(x+y+z)<=>z apartine M9=>z=9a+9b+9c.........18a+.....
=>(x+y+z) se divide cu (a+b+c) deoarece (....a+....b+...c) se divide cu (a+b+c)