👤
a fost răspuns

a+2b+c=51 2a+b+2c=42 a+b+c

Răspuns :

SerguyMD
a+2b+c=51
(+)⇒3a+3b+3c=93|:3
2a+b+2c=42 a+b+c=31
Cocirmariadenis

a + 2 b + c = 51  

2 a + b + 2 c = 42

________________ → adun sumele

3 a + 3 b + 3 c = 51 + 42

3 × ( a + b + c ) = 93

a + b + c = 93 : 3

a + b + c = 31

Alte intrebari