Question

*Sa se calculeze :

a) $\left|\begin{array}{ccc}3&-1&2\\1&4&5\\-2&-1&-1\end{array}\right|$
b) $\left|\begin{array}{ccc}2&1&3\\3&2&1\\1&3&2\end{array}\right|$
c) $\left|\begin{array}{ccc}1&2&-5\\2&-1&0\\4&-1&0\end{array}\right|$
d) $\left|\begin{array}{ccc}0!&1!&2!\\1!&2!&0!\\2!&0!&1!\end{array}\right|$
f) $\left|\begin{array}{ccc}10&20&40\\-1&-5&-7\\-100&200&400\end{array}\right|$
g) $\left|\begin{array}{ccc}11&21&47\\-1&18&7\\0&0&0\end{array}\right|$
h) $\left|\begin{array}{ccc}-8&2&8\\3&7&-3\\-1&5&1\end{array}\right|$
i) $\left|\begin{array}{ccc}300&400&500\\1&-1&4\\3&4&5\end{array}\right|$
j) $\left|\begin{array}{ccc}10&-1&3\\50&1&1\\100&2&1\end{array}\right|$
k) $\left|\begin{array}{ccc}5&11&-1\\15&22&-3\\25&44&-5\end{array}\right|$

Answer 1

a).3*4*(-1) + 1*(-1)*2 + (-1)*5*(-2) - (-2)*4*2 - (-1)*5*3 - 1*(-1)*(-1)= -12-2+10+16+15-1=21.

b).8+27+1-6-6-6=18.

c).0+0+10-20-0-0= -10

d).0+0+0-8-0-1= -9

de la f incolo faci la fel. Mai tarziu vei invata o metoda mai usoara, cu mai putine calcule.