Datrys =-[2/10b_{2}(2/10)+8/10log_{2}(8/10)]

$$= - [ \frac { 2 } { 10 } b _ { 2 } ( \frac { 2 } { 10 } ) + \frac { 8 } { 10 } \log _ { 2 } ( \frac { 8 } { 10 } ) ]$$

Enrhifo

$$-\frac{b_{2}}{25}+\frac{4\log_{2}\left(5\right)}{5}-\frac{8}{5}$$

Camau Ateb

Lluosi \frac{2}{10} a \frac{2}{10} i gael \left(\frac{2}{10}\right)^{2}.

$$-\left(\left(\frac{2}{10}\right)^{2}b_{2}+\frac{8}{10}\log_{2}\left(\frac{8}{10}\right)\right)$$

Lleihau'r ffracsiwn \frac{2}{10} i'r graddau lleiaf posib drwy dynnu a chanslo allan 2.

$$-\left(\left(\frac{1}{5}\right)^{2}b_{2}+\frac{8}{10}\log_{2}\left(\frac{8}{10}\right)\right)$$

Cyfrifo \frac{1}{5} i bŵer 2 a chael \frac{1}{25}.

$$-\left(\frac{1}{25}b_{2}+\frac{8}{10}\log_{2}\left(\frac{8}{10}\right)\right)$$

Lleihau'r ffracsiwn \frac{8}{10} i'r graddau lleiaf posib drwy dynnu a chanslo allan 2.

$$-\left(\frac{1}{25}b_{2}+\frac{4}{5}\log_{2}\left(\frac{8}{10}\right)\right)$$

Lleihau'r ffracsiwn \frac{8}{10} i'r graddau lleiaf posib drwy dynnu a chanslo allan 2.

$$-\left(\frac{1}{25}b_{2}+\frac{4}{5}\log_{2}\left(\frac{4}{5}\right)\right)$$

I ddod o hyd i wrthwyneb \frac{1}{25}b_{2}+\frac{4}{5}\log_{2}\left(\frac{4}{5}\right), dewch o hyd i wrthwyneb pob term.

$$-\frac{1}{25}b_{2}-\frac{4}{5}\log_{2}\left(\frac{4}{5}\right)$$

Ffactor

$$\frac{-b_{2}+20\log_{2}\left(5\right)-40}{25}$$

Camau Ateb

Ystyriwch \frac{1}{5}\times \frac{1}{5}b_{2}+\frac{4}{5}\ln(\frac{4}{5})\ln(2)^{-1}. Ffactora allan \frac{1}{25}.

$$\frac{b_{2}+20\log_{2}\left(\frac{4}{5}\right)}{25}$$

Ailysgrifennwch y mynegiad cyfan wedi'i ffactorio. Symleiddio.

$$-\frac{b_{2}+20\log_{2}\left(\frac{4}{5}\right)}{25}$$