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Sa se calculeze suma
U=lg1/2 + lg2/3+......+lg99/100


Răspuns :

[tex]lg \frac{1}{2} +lg \frac{2}{3} +...+lg \frac{99}{100} =lg(\frac{1}{2} * \frac{2}{3} *...* \frac{99}{100}) = \\= lg(\frac{1}{2} * \frac{2}{3} *...* \frac{98}{99}* \frac{99}{100})=lg \frac{1}{100} =lg 100^{-1} =-lg100 = -2[/tex]