Enrhifo
\frac{42}{11}\approx 3.818181818
Ffactor
\frac{2 \cdot 3 \cdot 7}{11} = 3\frac{9}{11} = 3.8181818181818183
Rhannu
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\frac{\left(4+\sqrt{5}\right)\left(4+\sqrt{5}\right)}{\left(4-\sqrt{5}\right)\left(4+\sqrt{5}\right)}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Mae'n rhesymoli enwadur \frac{4+\sqrt{5}}{4-\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â 4+\sqrt{5}.
\frac{\left(4+\sqrt{5}\right)\left(4+\sqrt{5}\right)}{4^{2}-\left(\sqrt{5}\right)^{2}}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Ystyriwch \left(4-\sqrt{5}\right)\left(4+\sqrt{5}\right). Gellir trawsnewid lluosi yn wahaniaeth rhwng sgwariau drwy ddefnyddio’r rheol: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{\left(4+\sqrt{5}\right)\left(4+\sqrt{5}\right)}{16-5}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Sgwâr 4. Sgwâr \sqrt{5}.
\frac{\left(4+\sqrt{5}\right)\left(4+\sqrt{5}\right)}{11}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Tynnu 5 o 16 i gael 11.
\frac{\left(4+\sqrt{5}\right)^{2}}{11}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Lluosi 4+\sqrt{5} a 4+\sqrt{5} i gael \left(4+\sqrt{5}\right)^{2}.
\frac{16+8\sqrt{5}+\left(\sqrt{5}\right)^{2}}{11}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(4+\sqrt{5}\right)^{2}.
\frac{16+8\sqrt{5}+5}{11}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Sgwâr \sqrt{5} yw 5.
\frac{21+8\sqrt{5}}{11}+\frac{4-\sqrt{5}}{4+\sqrt{5}}
Adio 16 a 5 i gael 21.
\frac{21+8\sqrt{5}}{11}+\frac{\left(4-\sqrt{5}\right)\left(4-\sqrt{5}\right)}{\left(4+\sqrt{5}\right)\left(4-\sqrt{5}\right)}
Mae'n rhesymoli enwadur \frac{4-\sqrt{5}}{4+\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â 4-\sqrt{5}.
\frac{21+8\sqrt{5}}{11}+\frac{\left(4-\sqrt{5}\right)\left(4-\sqrt{5}\right)}{4^{2}-\left(\sqrt{5}\right)^{2}}
Ystyriwch \left(4+\sqrt{5}\right)\left(4-\sqrt{5}\right). Gellir trawsnewid lluosi yn wahaniaeth rhwng sgwariau drwy ddefnyddio’r rheol: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{21+8\sqrt{5}}{11}+\frac{\left(4-\sqrt{5}\right)\left(4-\sqrt{5}\right)}{16-5}
Sgwâr 4. Sgwâr \sqrt{5}.
\frac{21+8\sqrt{5}}{11}+\frac{\left(4-\sqrt{5}\right)\left(4-\sqrt{5}\right)}{11}
Tynnu 5 o 16 i gael 11.
\frac{21+8\sqrt{5}}{11}+\frac{\left(4-\sqrt{5}\right)^{2}}{11}
Lluosi 4-\sqrt{5} a 4-\sqrt{5} i gael \left(4-\sqrt{5}\right)^{2}.
\frac{21+8\sqrt{5}}{11}+\frac{16-8\sqrt{5}+\left(\sqrt{5}\right)^{2}}{11}
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(4-\sqrt{5}\right)^{2}.
\frac{21+8\sqrt{5}}{11}+\frac{16-8\sqrt{5}+5}{11}
Sgwâr \sqrt{5} yw 5.
\frac{21+8\sqrt{5}}{11}+\frac{21-8\sqrt{5}}{11}
Adio 16 a 5 i gael 21.
\frac{21+8\sqrt{5}+21-8\sqrt{5}}{11}
Gan fod gan \frac{21+8\sqrt{5}}{11} a \frac{21-8\sqrt{5}}{11} yr un dynodydd, adiwch nhw drwy adio eu rhifiaduron.
\frac{42}{11}
Gwnewch y gwaith cyfrifo yn 21+8\sqrt{5}+21-8\sqrt{5}.
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