Evaluate
\frac{21}{25}=0.84
Factor
\frac{3 \cdot 7}{5 ^ {2}} = 0.84
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\frac{30+1}{5}-\frac{5\times 25+9}{25}
Multiply 6 and 5 to get 30.
\frac{31}{5}-\frac{5\times 25+9}{25}
Add 30 and 1 to get 31.
\frac{31}{5}-\frac{125+9}{25}
Multiply 5 and 25 to get 125.
\frac{31}{5}-\frac{134}{25}
Add 125 and 9 to get 134.
\frac{155}{25}-\frac{134}{25}
Least common multiple of 5 and 25 is 25. Convert \frac{31}{5} and \frac{134}{25} to fractions with denominator 25.
\frac{155-134}{25}
Since \frac{155}{25} and \frac{134}{25} have the same denominator, subtract them by subtracting their numerators.
\frac{21}{25}
Subtract 134 from 155 to get 21.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
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}