Enrhifo
4\sqrt{2}+8\approx 13.656854249
Rhannu
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\frac{8}{2-\sqrt{2}}
Cyfrifo ail isradd 4 a chael 2.
\frac{8\left(2+\sqrt{2}\right)}{\left(2-\sqrt{2}\right)\left(2+\sqrt{2}\right)}
Mae'n rhesymoli enwadur \frac{8}{2-\sqrt{2}} drwy luosi'r rhifiadur a'r enwadur â 2+\sqrt{2}.
\frac{8\left(2+\sqrt{2}\right)}{2^{2}-\left(\sqrt{2}\right)^{2}}
Ystyriwch \left(2-\sqrt{2}\right)\left(2+\sqrt{2}\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{8\left(2+\sqrt{2}\right)}{4-2}
Sgwâr 2. Sgwâr \sqrt{2}.
\frac{8\left(2+\sqrt{2}\right)}{2}
Tynnu 2 o 4 i gael 2.
4\left(2+\sqrt{2}\right)
Rhannu 8\left(2+\sqrt{2}\right) â 2 i gael 4\left(2+\sqrt{2}\right).
8+4\sqrt{2}
Defnyddio’r briodwedd ddosbarthu i luosi 4 â 2+\sqrt{2}.
Enghreifftiau
Hafaliad cwadratig
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometreg
4 \sin \theta \cos \theta = 2 \sin \theta
Hafaliad llinol
y = 3x + 4
Rhifyddeg
699 * 533
Matrics
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Hafaliad ar y pryd
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Gwahaniaethu
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integreiddiad
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Terfynau
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}