Evaluate
\frac{26}{21}\approx 1.238095238
Factor
\frac{2 \cdot 13}{3 \cdot 7} = 1\frac{5}{21} = 1.2380952380952381
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\frac{27}{21}-\frac{1}{21}
Least common multiple of 7 and 21 is 21. Convert \frac{9}{7} and \frac{1}{21} to fractions with denominator 21.
\frac{27-1}{21}
Since \frac{27}{21} and \frac{1}{21} have the same denominator, subtract them by subtracting their numerators.
\frac{26}{21}
Subtract 1 from 27 to get 26.
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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
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