Question

Determinați termenul necunoscut x,știind că 2^31+2^30+2^29=x•2^28

Answer 1

$2^{31}+2^{30}+2^{29}=x\cdot 2^{28}\\\text{Dam factor comun }2^{28}:\\2^{28}(2^3+2^2+2)=x\cdot 2^{28}\\2^{28}(8+4+2)=x\cdot 2^{28}\\2^{28}\cdot 14=x\cdot 2^{28}\\\boxed{x=14}$