METODA GRAFICA
oi albe ) I----I-3-I
oi negre ) I----I
1) EGALAM SEGMENTELE
15-3=12
2) CATE OI NEGRE ARE TARANUL ?
12:2=6
3) CATE OI ALBE ARE TARANUL ?
6+3=9
RASPUNS :
9 oi albe
6 oi negre
METODA ALGEBRICA
a→oi albe
n →→→oi negre
a+n=15
a=n+3
n+n+3=15
2n+3=15
2n=15-3
2n=12
n=12:2
n=6
a=6+3
a=9
VERIFICARE :
9+6=15
9-6=3
