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Daca 3a+2b+2c=45 si a+2b+2c=99, aflati a+b+c.

Răspuns :

Sper ca nu am gresit la vre.un calcul dar asa se face
Vezi imaginea ANDYYLOVESLOUIS
3a+2b+2c=45| a+2b+2c=99 | -> 3a+a+2b+2b+2c+2c=45+99 -> 4a+4b+4c=144/:4 -> a+b+c=36. Coroană pls!!!