Ma ajutati si pe mone la aceste exercitii ? Va rog este foarte URGENT ! Uitati-va la puncte.
Multumesc !


Determinati numarul x care verifica egalitatile :
5*(2x+3 ) + 4 *(2x+3)]:5=27

[3*(3x+7)+9]:16=3

2*{27-2*[3x-(35:5-2*3)]+3}:4=10

2*(3x+2)-22=5*(x+1)+78

DACA PUTETI SA MI-L FACETI DETALIAT !


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Răspunsuri

2014-10-20T19:17:55+03:00
5*(2x+3 ) + 4 *(2x+3)]:5=27
(5*2*x+5*3+ 4*2*x+4*3):5=27
(10*x+15+8*x+12):5=27
18*x+27=27*5
18*x+27=135
18*x=135-27
18*x=108
x=108:18
x=6


[3*(3x+7)+9]:16=3
(3*3*x+3*7+9):16=3
(9*x+21+9):16=3
9*x+30=3*16
9*x+30=48
9*x=48-30
9*x=18
x=18:9
x=2

2*{27-2*[3x-(35:5-2*3)]+3}:4=10
2*[27-2*(3*x-7+6)+3]:4=10
2*[27-2*(3*x-1)+3]:4=10

2*[27-2*3*x-2*1+3]:4=10
2*(28-6*x)=10*4
28-6*x=40:2
28-6*x=20
6*x=28-20
6*x=8
x=8:6
x=2/3


2*(3x+2)-22=5*(x+1)+78
2*3*x+2*2-22=5*x+5*1+78
6*x+4-22=5*x+5+78
6*x-5x=5+78-4+22
x=18


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