Evaluate
-\frac{40}{123}\approx -0.325203252
Factor
-\frac{40}{123} = -0.3252032520325203
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\frac{\frac{8}{5}}{\frac{2}{25}-5}
Anything divided by one gives itself.
\frac{\frac{8}{5}}{\frac{2}{25}-\frac{125}{25}}
Convert 5 to fraction \frac{125}{25}.
\frac{\frac{8}{5}}{\frac{2-125}{25}}
Since \frac{2}{25} and \frac{125}{25} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{8}{5}}{-\frac{123}{25}}
Subtract 125 from 2 to get -123.
\frac{8}{5}\left(-\frac{25}{123}\right)
Divide \frac{8}{5} by -\frac{123}{25} by multiplying \frac{8}{5} by the reciprocal of -\frac{123}{25}.
\frac{8\left(-25\right)}{5\times 123}
Multiply \frac{8}{5} times -\frac{25}{123} by multiplying numerator times numerator and denominator times denominator.
\frac{-200}{615}
Do the multiplications in the fraction \frac{8\left(-25\right)}{5\times 123}.
-\frac{40}{123}
Reduce the fraction \frac{-200}{615} to lowest terms by extracting and canceling out 5.
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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y = 3x + 4
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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}