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STIIND CA: a+a+a=9 b-a=24 afla b+a=? mersy....

Răspuns :

a+a+a=9 <=> 3a=9 => a=9/3 => a=3
b-a=24 => b=24+a <=> b=24+3 => b=27 
 
b+a=27+3 => b+a=30
Deci pe a+a+a=9 putem sa-l scrim ca 3a=9⇔a=9:3⇔a=3
Inlocuim in a 2 ecuatie
b-3=24⇔b=24+3⇔b=27
b+a=27+3=30
Succes