Enrhifo
\frac{4\sqrt{21}}{21}\approx 0.872871561
Rhannu
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\frac{\sqrt{16}}{\sqrt{21}}
Ailysgrifennu ail isradd y rhaniad \sqrt{\frac{16}{21}} fel rhaniad ail israddau \frac{\sqrt{16}}{\sqrt{21}}.
\frac{4}{\sqrt{21}}
Cyfrifo ail isradd 16 a chael 4.
\frac{4\sqrt{21}}{\left(\sqrt{21}\right)^{2}}
Mae'n rhesymoli enwadur \frac{4}{\sqrt{21}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{21}.
\frac{4\sqrt{21}}{21}
Sgwâr \sqrt{21} yw 21.
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}