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Calculati 5xy+5xz+21 stiind ca x=4 si y+x=100

Răspuns :

5xy+5xz+21= 5x(y+z)+21= 5•4•100+21= 20•100+21= 2000+21= 2021  
5xy+5xz+21= 5x(y+z)+21= 5•4•100+21= 2000+21= 2021

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