Răspuns :
5p+3c=66
7p+2c=66
5p+3c=7p+2c
C=2p
5p+3x2p=66
5p+6p=66
11p=66
P=66:11
P=6
C=2x6
C=12
Un pix costa 6 lei, iar o carte costa 12 lei
7p+2c=66
5p+3c=7p+2c
C=2p
5p+3x2p=66
5p+6p=66
11p=66
P=66:11
P=6
C=2x6
C=12
Un pix costa 6 lei, iar o carte costa 12 lei
5p +3c=66
7p+2c=66
5p+3c=7p+2c
3c-2c=7p-5p
c=2p
5p+3x2p=66
5p+6p=66p
11p=66
p=6 lei (pix)
c=2x6
c=12 lei(carte)
7p+2c=66
5p+3c=7p+2c
3c-2c=7p-5p
c=2p
5p+3x2p=66
5p+6p=66p
11p=66
p=6 lei (pix)
c=2x6
c=12 lei(carte)