Datrys sqrt{80}-(sqrt{20}-5sqrt{1/5})

Enrhifo

Cwis

Arithmetic

5 problemau tebyg i:

Problemau tebyg o chwiliad gwe

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Rhannu

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4\sqrt{5}-\left(\sqrt{20}-5\sqrt{\frac{1}{5}}\right)

Ffactora 80=4^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{4^{2}\times 5} fel lluoswm ail israddau \sqrt{4^{2}}\sqrt{5}. Cymryd isradd 4^{2}.

4\sqrt{5}-\left(2\sqrt{5}-5\sqrt{\frac{1}{5}}\right)

Ffactora 20=2^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 5} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{5}. Cymryd isradd 2^{2}.

4\sqrt{5}-\left(2\sqrt{5}-5\times \frac{\sqrt{1}}{\sqrt{5}}\right)

Ailysgrifennu ail isradd y rhaniad \sqrt{\frac{1}{5}} fel rhaniad ail israddau \frac{\sqrt{1}}{\sqrt{5}}.

4\sqrt{5}-\left(2\sqrt{5}-5\times \frac{1}{\sqrt{5}}\right)

Cyfrifo ail isradd 1 a chael 1.

4\sqrt{5}-\left(2\sqrt{5}-5\times \frac{\sqrt{5}}{\left(\sqrt{5}\right)^{2}}\right)

Mae'n rhesymoli enwadur \frac{1}{\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{5}.

4\sqrt{5}-\left(2\sqrt{5}-5\times \frac{\sqrt{5}}{5}\right)

Sgwâr \sqrt{5} yw 5.

4\sqrt{5}-\left(2\sqrt{5}-\sqrt{5}\right)

Canslo 5 a 5.

4\sqrt{5}-\sqrt{5}

Cyfuno 2\sqrt{5} a -\sqrt{5} i gael \sqrt{5}.