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Probleme matematică

Last Updated: Aug 09 2017 07:31, Started by Zamo , Mar 14 2008 18:22

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4923 replies to this topic

#4177
vvilmos

Posted 16 January 2016 - 17:15

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Intr-adevar, polinoamele sunt studiate acum numai in clasa 12, intr-un cadru general (peste inele). Dar majoritatea profesorilor competenti folosesc polinoamele (cu coeficienti reali) mult mai devreme (chiar gimnaziu), asa cum ar fi de altfel normal.

#4178
VladBtz

Posted 16 January 2016 - 17:31

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Deduceţi regula după care este generat şirul

1 1 2 4 3 6 36 1 4 16 5 10 100

#4179
vvilmos

Posted 16 January 2016 - 19:35

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a(n) = (1/17600)*n^12-(63563/13305600)*n^11+(64909/362880)*n^10-(2854967/725760)*n^9+(8531431/151200)*n^8-(95770697/172800)*n^7+(65795437/17280)*n^6-(1479772421/80640)*n^5+(27776002771/453600)*n^4-(124327471091/907200)*n^3+(2682633713/13860)*n^2-(75755398/495)*n+50345

E corect! a(1)=1, ..., a(13)=100. Rezulta a(14)=49141.

#4180
RazvanQR

Posted 23 January 2016 - 18:34

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Salut, am incercat sa rezolv o probleme dar tot nu-i dau de cap si nu stiu ce pot sa fac, daca ma puteti ajuta cu un sfat.Enuntul problemei este aici:

http://postimg.org/image/y2wr9381z/

iar rezolvarea mea partiala este aici, dar nu inteleg cum sa fac mai departe...

http://postimg.org/image/e62bh0yrp/

In loc de cos( a + b ) ii cos( x + y ).

Edited by RazvanQR, 23 January 2016 - 18:34.

#4181
pasilla

Posted 23 January 2016 - 18:48

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Cat e (a+ b )^2 ?

Edited by pasilla, 23 January 2016 - 18:49.

#4182
aLexCM

Posted 23 January 2016 - 18:48

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Ai ridicat gresit parantezele alea la patrat. Si cosxcosy + sinxsiny = cos(x-y)

Mie imi da E. Altcineva?

Edited by aLexCM, 23 January 2016 - 18:51.

#4183
RazvanQR

Posted 23 January 2016 - 18:50

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PFUUU, acum mi-am dat seama...Doamne ce neatent sunt....

#4184
Cy_Cristian

Posted 23 January 2016 - 18:55

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Ai uitat cos^2y+sin^2y. De acolo se duce totul.

#4185
RazvanQR

Posted 23 January 2016 - 18:56

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Am ajuns la: cos(x-y)=1 , aici nu stiu cum ii cu x-y din enuntul problemei.

Edited by RazvanQR, 23 January 2016 - 18:59.

#4186
lacrimidedor

Posted 23 January 2016 - 18:59

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x=y

#4187
aLexCM

Posted 23 January 2016 - 19:01

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Ai formula pentru asa ceva. Cauta la ecuatii trigonometrice fundamentale.

lacrimidedor, on 23 ianuarie 2016 - 18:59, said:

x=y

Asta-i doar unul din rezultate.

#4188
RazvanQR

Posted 23 January 2016 - 19:03

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x=y => cos0=1
y=x => cos0=1

Sau nu am inteles... ?

#4189
aLexCM

Posted 23 January 2016 - 19:09

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Vezi aici ECUATIA cos x = a

Foloseste-te de formula.

Da. Daca x=y atunci cosinul este 1. Dar asta e mai mult deductie dupa ce ai invatat in generala valorile sinusului/cosinusului. Aplica formula. O sa iti mai dea doua solutii in plus.

Edited by aLexCM, 23 January 2016 - 19:11.

#4190
RazvanQR

Posted 23 January 2016 - 19:35

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Am inteles, multumesc mult de tot.

#4191
TruculMagic

Posted 23 January 2016 - 20:17

Egalitatea nu există decât în matematică

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RazvanQR, on 23 ianuarie 2016 - 18:34, said:

Cred ca o sa-ti treaca cand o sa faci cate 4 ore de mate pe zi (2 seminarii parca) Posted Image

#4192
andreea0201

Posted 28 January 2016 - 18:59

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Daca este element neutru in spatiul euclidian respectiv, dimensiunea subspatiului care contine elementul neutru este n? Si atunci complementul ortogonal are dimensiunea n-1?

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#4193
vvilmos

Posted 28 January 2016 - 20:04

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Dacă θ este elementul neutru (uzual e notat 0), subspaţiul generat de acesta este {θ} şi deci dimensiunea sa este 0.
Complementul ortogonal este E (adică spaţiul întreg), având deci dimensiunea n.

(Pentu orice element x diferit de θ, complementul ortogonal al subspaţiului generat de x are într-adevăr dimensiunea n-1.)

Edited by vvilmos, 28 January 2016 - 20:17.

#4194
andreea0201

Posted 28 January 2016 - 20:27

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deci elementul neutru al spatiului euclidian este vectorul nul θ? Si atunci subspatiul {θ} nu formeaza baza si de aceea dimensiunea e 0

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Probleme matematică

#4177 vvilmos Posted 16 January 2016 - 17:15

#4178 VladBtz Posted 16 January 2016 - 17:31

#4179 vvilmos Posted 16 January 2016 - 19:35

#4180 RazvanQR Posted 23 January 2016 - 18:34

#4181 pasilla Posted 23 January 2016 - 18:48

#4182 aLexCM Posted 23 January 2016 - 18:48

#4183 RazvanQR Posted 23 January 2016 - 18:50

#4184 Cy_Cristian Posted 23 January 2016 - 18:55

#4185 RazvanQR Posted 23 January 2016 - 18:56

#4186 lacrimidedor Posted 23 January 2016 - 18:59

#4187 aLexCM Posted 23 January 2016 - 19:01

#4188 RazvanQR Posted 23 January 2016 - 19:03

#4189 aLexCM Posted 23 January 2016 - 19:09

#4190 RazvanQR Posted 23 January 2016 - 19:35

#4191 TruculMagic Posted 23 January 2016 - 20:17

#4192 andreea0201 Posted 28 January 2016 - 18:59

Attached Files

#4193 vvilmos Posted 28 January 2016 - 20:04

#4194 andreea0201 Posted 28 January 2016 - 20:27

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#4177
vvilmos

Posted 16 January 2016 - 17:15

#4178
VladBtz

Posted 16 January 2016 - 17:31

#4179
vvilmos

Posted 16 January 2016 - 19:35

#4180
RazvanQR

Posted 23 January 2016 - 18:34

#4181
pasilla

Posted 23 January 2016 - 18:48

#4182
aLexCM

Posted 23 January 2016 - 18:48

#4183
RazvanQR

Posted 23 January 2016 - 18:50

#4184
Cy_Cristian

Posted 23 January 2016 - 18:55

#4185
RazvanQR

Posted 23 January 2016 - 18:56

#4186
lacrimidedor

Posted 23 January 2016 - 18:59

#4187
aLexCM

Posted 23 January 2016 - 19:01

#4188
RazvanQR

Posted 23 January 2016 - 19:03

#4189
aLexCM

Posted 23 January 2016 - 19:09

#4190
RazvanQR

Posted 23 January 2016 - 19:35

#4191
TruculMagic

Posted 23 January 2016 - 20:17

#4192
andreea0201

Posted 28 January 2016 - 18:59

#4193
vvilmos

Posted 28 January 2016 - 20:04

#4194
andreea0201

Posted 28 January 2016 - 20:27