Răspuns:
s=stilou
c=caiet
cr=creion
2s+3c=27
4c+5cr=30
s=3cr
inlocuim
2*3cr+3c=27
5cr+4c=30
6cr+3c=27|4
5cr+4c=30|3
24cr+12c=108
15cr+12c=90
__________
9cr=18
cr=2 lei => s=3*2=6 lei
3c=27-6*2
3c=27-12
3c=15
c=5 lei
2.
s=stilou
c=caiet
p=pix
3s+5c=65
2c+3p=26
7s+2p=78
luam primele doua ecuatii
3s+5c=65|*2
2c+3p=26|*5
6s+10c=130
15p+10c=130
_______
6s-15p=0 => 2s-5p=0
2s-5p=0|*2
7s+2p=78|*5
4s-10p=0
35s+10p=390
___________
39s=390
s=10
7*10+2p=78
70+2p=78
2p=8
p=4
3*10+5c=65
30+5c=65
5c=35
c=7
Explicație pas cu pas:
