problema de tehnica

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Marius Dragoi
Thales
Posts: 126
Joined: Thu Jan 31, 2008 5:57 pm
Location: Bucharest

problema de tehnica

Post by Marius Dragoi »

Demonstrati ca pentru orice \( x \in N \), exista \( y,z \in N \) astfel incat numarul \( (x+1)(y+1)(z+1) \) sa fie de forma \( a^6 \) cu \( a \in N \).
Politehnica University of Bucharest
The Faculty of Automatic Control and Computers
marius00
Euclid
Posts: 22
Joined: Fri Mar 07, 2008 8:26 pm

Post by marius00 »

\(

y = x^2 + 2x \\
z = x^3 + 3x^2 + 3x \\
(x + 1)(y + 1)(z + 1) = (x + 1)(x + 1)^2 (x + 1)^3 = (x + 1)^6 \\

\)
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