Răspunsuri

2014-06-14T16:02:09+03:00
Creion=c
pix=p
 

5c+6p=28 lei
3c+6p=24 lei

c=? lei
 
 28-24=4 (pret 2c)
 1c=4:2
 1c=2
1 5 1
2014-06-14T16:02:16+03:00
5c+6p=28

3c+6p=24 /:3
c+2p=8
c=8-2p

5(8-2p)+6p=28
40-10p+6p=28
40-28=10p-6p
12=4p
p=12:4
p=3

c=8-2*3
c=8-6
c=2

VERIFICARE:
5*2+6*3=28
10+18=28
1 5 1