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afla nr necunoscute si verifica : 5y+36×4+36×3+36×2 =504

Răspuns :

5y+144+108+72-504=0
y=180 pe 5
y=36
a)5y+36×4+36×3+36×2 =504                  5y+324=504
5y+324−324=504−324
5y=180
5y/5=180/5
y=36