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prin potentiere, sa se determine x, daca lgx=2lg5-3lg2-0,5lg625+0,25lg256

Răspuns :

[tex]lgx=lg25-lg8-lg25+lg4 \\ lgx=lg4-lg8 \\ lgx= lg\frac{4}{8} \\ x= \frac{4}{8} \\ x= \frac{1}{2} [/tex]