Evaluate
\frac{21}{26}\approx 0.807692308
Factor
\frac{3 \cdot 7}{2 \cdot 13} = 0.8076923076923077
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\frac{\left(4\times 5+1\right)\times 5}{5\left(5\times 5+1\right)}
Divide \frac{4\times 5+1}{5} by \frac{5\times 5+1}{5} by multiplying \frac{4\times 5+1}{5} by the reciprocal of \frac{5\times 5+1}{5}.
\frac{1+4\times 5}{1+5\times 5}
Cancel out 5 in both numerator and denominator.
\frac{1+20}{1+5\times 5}
Multiply 4 and 5 to get 20.
\frac{21}{1+5\times 5}
Add 1 and 20 to get 21.
\frac{21}{1+25}
Multiply 5 and 5 to get 25.
\frac{21}{26}
Add 1 and 25 to get 26.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\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]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}