a - primul elev
b - al doilea elev
a+b=21
a=3+b
3+b+b=21
2b=21-3=18
b=18:2
b=9
a=3+9
a=12
Răspuns:
succes!
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a - primul elev
b - al doilea elev
a+b=21
a=3+b
3+b+b=21
2b=21-3=18
b=18:2
b=9
a=3+9
a=12
Răspuns:
succes!