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Cardinal

 
Post new topic   Reply to topic    mateforum.ro Forum Index -> Clasa a XI-a -> Algebra
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Skat



Joined: 04 Jan 2013
Posts: 1

PostPosted: Fri Jan 04, 2013 1:28 pm    Post subject: Cardinal Reply with quote

Buna ziua! N-am mai lucrat nimic la matematica de cand am luat vacanta asa ca am zis sa ma apuc de lucru sa nu fiu nepregatit cand incepe scoala. Problema e ca am cam uitat tot ce am facut pana acum.


Problema este urmatoarea:
Calculati card (AUB) stiind card A=7, card B=8 si card (A intersectat cu B)=4.

Vreau daca se poate o explicatie pas cu pas fiindca am de rezolvat multe probleme de genul acesta si vreau sa inteleg.
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Laurian Filip
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Joined: 25 Nov 2007
Posts: 473
Location: Bucuresti

PostPosted: Sat Jan 05, 2013 1:43 pm    Post subject: Reply with quote

Ai o formula care iti spune ca card(AUB)=card(A)+card(B)-card(A\cap B).
De aici ai card(AUB)=7+8-4=11.
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