Evaluate
7.8
Factor
\frac{3 \cdot 13}{5} = 7\frac{4}{5} = 7.8
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\frac{15.4+7.7+7.8+8+7.9+7.7+7.9}{8}
Add 7.6 and 7.8 to get 15.4.
\frac{23.1+7.8+8+7.9+7.7+7.9}{8}
Add 15.4 and 7.7 to get 23.1.
\frac{30.9+8+7.9+7.7+7.9}{8}
Add 23.1 and 7.8 to get 30.9.
\frac{38.9+7.9+7.7+7.9}{8}
Add 30.9 and 8 to get 38.9.
\frac{46.8+7.7+7.9}{8}
Add 38.9 and 7.9 to get 46.8.
\frac{54.5+7.9}{8}
Add 46.8 and 7.7 to get 54.5.
\frac{62.4}{8}
Add 54.5 and 7.9 to get 62.4.
\frac{624}{80}
Expand \frac{62.4}{8} by multiplying both numerator and the denominator by 10.
\frac{39}{5}
Reduce the fraction \frac{624}{80} to lowest terms by extracting and canceling out 16.
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}