3 x a + b=7
5 x b + 2 x c =16 sa se calculeze 6 x a +12 x b + 4x c = ?​

Răspuns:

3a+b=7 /×2

5b+2c=16/×2

6a+2b+10b+4c=16×2+7×2

=46

Salut!

[tex] 3 \times a + b = 7 | \times 2 \: (inmultim \: \: relatia \: \: cu \: \: 2[/tex]

[tex]5 \times b + 2 \times c = 16 | \times 2 \: (inmultim \: \: relatia \: \: cu \: \: 2)[/tex]

[tex]6 \times a + 12 \times b + 4 \times c = 7 \times 2 + 16 \times 2[/tex]

[tex] = > 14 + 32 \\ = > 46 - > numarul \: \: cautat[/tex]

Succes!