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Adyflory12
a fost răspuns

am problema
2a+b+c=142; a+2b+c+144; a+b+2c=146.Afla suma a+b+c

Răspuns :

[tex]2a+b+c=142 \\ \\ a+2b+c=144 \\ \\ a+b+2c=146 \\ ==========\ \ adunam \ \ relatiile \\ 4a+4b+4c=432/:4=>\boxed{a+b+c=108}[/tex]
Deva
2a+b+c+a+2b+c+a+b+2c=142+144+146   le-am adunat
4a+4b+4c=432
4(a+b+c)=432
a+b+c=432:4=108

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