Δ x = b − a n {\displaystyle \Delta x={\frac {b-a}{n}}}
Δ x f ( x i ) {\displaystyle \Delta x\,f\left(x_{i}\right)}
Δ x 2 ( f ( x 0 ) + 2 f ( x 1 ) + . . . + 2 f ( x n − 1 ) + f ( x n ) ) {\displaystyle {\frac {\Delta x}{2}}\left(f\left(x_{0}\right)+2f\left(x_{1}\right)+...+2f\left(x_{n-1}\right)+f\left(x_{n}\right)\right)}
Δ x 3 ( f ( x 0 ) + 4 f ( x 1 ) + 2 f ( x 2 ) . . . + 2 f ( x n − 2 ) + 4 f ( x n − 1 ) + f ( x n ) ) {\displaystyle {\frac {\Delta x}{3}}\left(f\left(x_{0}\right)+4f\left(x_{1}\right)+2f\left(x_{2}\right)...+2f\left(x_{n-2}\right)+4f\left(x_{n-1}\right)+f\left(x_{n}\right)\right)}
