1,8 : \frac { 9 } { 20 }
Evaluate
4
Factor
2^{2}
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1,8\times \frac{20}{9}
Divide 1,8 by \frac{9}{20} by multiplying 1,8 by the reciprocal of \frac{9}{20}.
\frac{9}{5}\times \frac{20}{9}
Convert decimal number 1,8 to fraction \frac{18}{10}. Reduce the fraction \frac{18}{10} to lowest terms by extracting and canceling out 2.
\frac{9\times 20}{5\times 9}
Multiply \frac{9}{5} times \frac{20}{9} by multiplying numerator times numerator and denominator times denominator.
\frac{20}{5}
Cancel out 9 in both numerator and denominator.
4
Divide 20 by 5 to get 4.
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}