Odpowiedź:
|A| = [tex]\left[\begin{array}{ccc}1&-2&1\\2&1&-1\\3&-1&2\end{array}\right][/tex] = 1*1*2 + 2*(-1)*1 + 3*(-2)*(-1) - 1*1*3 - (-1)*(-1)*1 - 2*(-2)*2 = 10
|Ay| = [tex]\left[\begin{array}{ccc}1&1&4\\2&1&3\\3&2&7\end{array}\right][/tex] = 1*1*7 + 2*2*4 + 3*1*3 - 4*1*3 - 3*2*1 - 7*1*2 = 0
y = [tex]\frac{|Ay|}{|A|}[/tex] = [tex]\frac{0}{10}[/tex] = 0
