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Am si eu nevoie de ajutor la 2 exercitii, mentionez ca nu sunt bun la mate

 
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Alecks.

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Post Posted: 11-04-2014, 11:46:27 | Translate post to: ... (Click for more languages)

mda, deci mersi pentru ajutor, si iata exercitiile:

I) 6(3x-2)-5=7x-2
x este litera nu inmultire

II)15x-6 supra 4 -3x supra 2= 1

x e litera

am nevoie de o rezolvare simpla nu doar de rezultat va multumesc!

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andrutz4

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Post Posted: 11-04-2014, 21:26:22 | Translate post to: ... (Click for more languages)

1. 18x-12-5=7x-2
18x-17=7x-2
18x-7x=-2+17
11x=15 x=15/11

2. a doua fractie o amplifici cu 2,iar pe 1 cu 4 si o sa ai
15x-6-6x=4
9x=4+6
9x=10 x=10/9
Poate raspunsurile nu sunt numere intregi dar nu vad nici o greseala -


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Heineken ;x
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Post Posted: 14-04-2014, 19:23:25 | Translate post to: ... (Click for more languages)

Alecks. wrote:
mda, deci mersi pentru ajutor, si iata exercitiile:

I) 6(3x-2)-5=7x-2
x este litera nu inmultire

II)15x-6 supra 4 -3x supra 2= 1

x e litera

am nevoie de o rezolvare simpla nu doar de rezultat va multumesc!

6(3x-2)-5=7x-2
18x-12-5=7x-2
18x-17=7x-2
18x-7x=-2+17
11x=15
x= 15/11
Observatie : Atunci cand muti un numar , de pe o parte pe alta , acel numar il treci cu semn schimbat !
Exemplu : -2x=4 => x= 4/2 => x=2
Observatie 2 : x = inmultire ! => - x - = +
- x + = -
+ x + = +
(15x-6)/4 -3x/2 =1
1. Trebuie sa aducem la acelasi numitor comun !
(15x-6)/4 - (3x/2) totul la puterea a 2 = 1 la puterea a 4
15x-6-3x=1
12x=7
x=7/12
Sper ca am fost de ajutor ! Multa bafta !


ROG UN MODERATOR SA IMI BLOCHEZE ACEST CONT !
NOUL MEU CONT VA FI Heineken.
MULTUMESC !
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andrutz4

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Post Posted: 14-04-2014, 21:47:41 | Translate post to: ... (Click for more languages)

Heineken,il inveti prostii - ma doare capul cand vad ce ai scris la al doilea exercitiu..sa nu mai zic observatiile de la primul

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