Evaluate
\frac{39}{2}=19.5
Factor
\frac{3 \cdot 13}{2} = 19\frac{1}{2} = 19.5
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\frac{13\times 72}{3\times 16}
Divide \frac{13}{3} by \frac{16}{72} by multiplying \frac{13}{3} by the reciprocal of \frac{16}{72}.
\frac{3\times 13}{2}
Cancel out 3\times 8 in both numerator and denominator.
\frac{39}{2}
Multiply 3 and 13 to get 39.
Examples
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y = 3x + 4
Arithmetic
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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}