Evaluate
\frac{211}{21}\approx 10.047619048
Factor
\frac{211}{3 \cdot 7} = 10\frac{1}{21} = 10.047619047619047
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20-\frac{189+20}{21}
Multiply 9 and 21 to get 189.
20-\frac{209}{21}
Add 189 and 20 to get 209.
\frac{420}{21}-\frac{209}{21}
Convert 20 to fraction \frac{420}{21}.
\frac{420-209}{21}
Since \frac{420}{21} and \frac{209}{21} have the same denominator, subtract them by subtracting their numerators.
\frac{211}{21}
Subtract 209 from 420 to get 211.
Examples
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
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}