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TEMA ALGB SI GEO

 
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EuGENlol

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(since 01-11-2012 14:22)
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Post Posted: 31-10-2012, 18:15:03 | Translate post to: ... (Click for more languages)

(V98 - 4V8) * (3V648 + 9V242 - V126 * V567)=
(V735 + V27 * V180) * (V45 * V48 - V1815) : 15 =
[(15V2 - 18V3)(6V3+14V2)-6]:9+18V6
[V20*(V150+4V96)-2V135*V72]*(V30+V120)

V= RADICAL
* = IMULTIT

3. Desenati cubul ABCDA'B'C'D'. Determinati:

a) m(<A'C', <BC)
b) m(BC', AC)

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Froster

[The doctor is in]



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Post Posted: 02-11-2012, 18:41:35 | Translate post to: ... (Click for more languages)

Desenezi cubul. Observi ca m ( A'C' si BC) ar fi totuna cu m(A'C'B') deoarece BC || B'C' => unghiul e de 45 de grade.


m(BC', AC) <=> m(BC'A') deoarece AC||A'C'. Triunghiul BC'A' este echilateral (toate sunt diagonale ale fetelor cubului) => unghiul e de 60 de grade.


O sa revin cu calcule pentru problema 1. Un mic sfat: te asteapta liceul in fata, apuca-te si invata, fiindca asta-i matematica pentru teza nationala/capacitate/ce dai acum.



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