Evaluate
\frac{3}{7}\approx 0.428571429
Factor
\frac{3}{7} = 0.42857142857142855
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\frac{1+2}{21}+\frac{2}{21}+\frac{4}{21}
Since \frac{1}{21} and \frac{2}{21} have the same denominator, add them by adding their numerators.
\frac{3}{21}+\frac{2}{21}+\frac{4}{21}
Add 1 and 2 to get 3.
\frac{3+2}{21}+\frac{4}{21}
Since \frac{3}{21} and \frac{2}{21} have the same denominator, add them by adding their numerators.
\frac{5}{21}+\frac{4}{21}
Add 3 and 2 to get 5.
\frac{5+4}{21}
Since \frac{5}{21} and \frac{4}{21} have the same denominator, add them by adding their numerators.
\frac{9}{21}
Add 5 and 4 to get 9.
\frac{3}{7}
Reduce the fraction \frac{9}{21} to lowest terms by extracting and canceling out 3.
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}