Evaluate
-\frac{8}{81}\approx -0.098765432
Factor
-\frac{8}{81} = -0.09876543209876543
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\frac{1}{81}-\frac{9}{81}
Least common multiple of 81 and 9 is 81. Convert \frac{1}{81} and \frac{1}{9} to fractions with denominator 81.
\frac{1-9}{81}
Since \frac{1}{81} and \frac{9}{81} have the same denominator, subtract them by subtracting their numerators.
-\frac{8}{81}
Subtract 9 from 1 to get -8.
Examples
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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
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Limits
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