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sa se calculeze daca se stie a+3b=5 si c=8 calculeaza 4a+12b+5c

Răspuns :

a+3b=5
c=8
4a+12b+5c=?

a+3b=5/×4
4a+12b=20
c=8/×5
5c=40
=>4a+12b+5c=20+40
4a+12b+5c=60

sper ca te.am ajutat