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(prin metoda figurativa)
a+b=82
a-b=20
a=? b=?


Răspuns :

a+b=82:2=41 a=41;b=41 a-b=20 a=10;b=10
a|-----|20|
b|-----|
82-20=62
b=62:2=31
a=31+20=51