Evaluate
\frac{28}{39}\approx 0.717948718
Factor
\frac{2 ^ {2} \cdot 7}{3 \cdot 13} = 0.717948717948718
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\frac{\frac{1}{3}+\frac{6}{3}}{\frac{5}{4}+2}
Convert 2 to fraction \frac{6}{3}.
\frac{\frac{1+6}{3}}{\frac{5}{4}+2}
Since \frac{1}{3} and \frac{6}{3} have the same denominator, add them by adding their numerators.
\frac{\frac{7}{3}}{\frac{5}{4}+2}
Add 1 and 6 to get 7.
\frac{\frac{7}{3}}{\frac{5}{4}+\frac{8}{4}}
Convert 2 to fraction \frac{8}{4}.
\frac{\frac{7}{3}}{\frac{5+8}{4}}
Since \frac{5}{4} and \frac{8}{4} have the same denominator, add them by adding their numerators.
\frac{\frac{7}{3}}{\frac{13}{4}}
Add 5 and 8 to get 13.
\frac{7}{3}\times \frac{4}{13}
Divide \frac{7}{3} by \frac{13}{4} by multiplying \frac{7}{3} by the reciprocal of \frac{13}{4}.
\frac{7\times 4}{3\times 13}
Multiply \frac{7}{3} times \frac{4}{13} by multiplying numerator times numerator and denominator times denominator.
\frac{28}{39}
Do the multiplications in the fraction \frac{7\times 4}{3\times 13}.
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}