Răspunsuri

2014-02-01T16:41:00+02:00
Fie c pretul unui creion si p pretul unui pix.

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

(5c+6p)-(3c+6p)=4
2c=4 
c=2

 \left\{ {{5c + 6p=28} \atop {c=2}} \right. => 6p=28-10=18
=> p=18:6 = 3

23c = 23*2 = 46 lei
11p = 11*3 = 33 lei
2014-02-01T16:45:32+02:00
5c ........6p.......28lei
3c.........6p........24lei

Atunci:

2c........0p........4lei

1c....................2 lei

 s.a.m.d.