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Matrice

 
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Silvian
Euclid


Joined: 19 Aug 2011
Posts: 12
Location: Bucuresti

PostPosted: Wed Sep 07, 2011 4:14 pm    Post subject: Matrice Reply with quote

Fie matricea A(x)=
( 5x+1 10x)
(-2x 1-4x)
Sa se calculeze suma A(1)+A(2)+A(3)+.........A(n),n e N*
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Mateescu Constantin
Newton


Joined: 21 Apr 2009
Posts: 398
Location: Londra/Pitesti

PostPosted: Wed Sep 07, 2011 4:21 pm    Post subject: Reply with quote

\sum_{k=1}^n\, A\left(k\right)=\left\(\begin{array}{cccc}
\frac {5n^2+7n}2 && 5n(n+1) \\\\\\\\\ 
-n(n+1) && -2n^2-n\end{array}\right\)
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PhantomR
Pitagora


Joined: 20 Mar 2011
Posts: 86

PostPosted: Thu Sep 08, 2011 5:30 pm    Post subject: Reply with quote

Cred ca lipseste un 2 din fata lui n la elementul din coloana a doua, linia a doua. Very Happy
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Mateescu Constantin
Newton


Joined: 21 Apr 2009
Posts: 398
Location: Londra/Pitesti

PostPosted: Fri Sep 09, 2011 7:55 pm    Post subject: Reply with quote

Eu nu prea cred ... Wink
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PhantomR
Pitagora


Joined: 20 Mar 2011
Posts: 86

PostPosted: Fri Sep 09, 2011 11:03 pm    Post subject: Reply with quote

M-am prostit rau Laughing, nu mai stiu sa adun.

Imi cer scuze!
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