x= ( 2^900x2^600+32^400:2^500)x2
= ( 2^1500+2^5^400: 2^500) x2
= 2^1500 + 2^2000 : 2^500) x2
= (2^1500 + 2^1500) x2
= 2^1500 x ( 1+ 1) x2
= 2 ^ 1500 x 2 X2
= 2^ 1500 X 2^2
= 2 ^ 1502 = 2^751
y= 5x( 3^2002-3^2001-9^1000)
= 5x [3^2003-3^2001-(3^2)^1000]
= 5x( 3^2003-3^2001-3^2000)
= 5x 3^2000 x( 3^2-3-1)
= 5x 3^2000x (9-3-1)
= 5x 3^2000x 5
=5 ^2 x (3^1000)^2
Produsul a doua numere patrate are ca rezultat un numar patrat