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Alexandrogrigore
a fost răspuns

Se stie ca a+2b+c=51 si 2a+b+2c=42.aflati a+b+c. Va rig repede

Răspuns :

a+2b+c+2a+b+2c=51+42
3a+3b+3c+93
3(a+b+c)=93
a+b+c=93:3
a+b+c=31
a+2b+c=51
2a+b+2c=42
a+b+c=?
a+2b+c+2a+b+2c=51+42
3a+3b+3c=93
3*(a+b+c)=93
a+b+c=93:3
a+b+c=31

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