Ч^Оо
$3$\displaystyle{ =\int _{{\alpha}}^{{\beta}} $ x- {\alpha} $ \{ $ x- {\alpha} $ - $ {\beta}- {\alpha} $ \} dx }$
$3$\displaystyle{=\int _{{\alpha}}^{{\beta}} { $ x- {\alpha} $ }^{2}dx }$
Б@ $3$\displaystyle{- \int _{{\alpha}}^{{\beta}} $ x- {\alpha} $ $ {\beta}- {\alpha} $ dx }$
$3$\displaystyle{= \[ \frac{\hspace{2} { $ x- {\alpha} $ }^{3} \hspace{2}}{\hspace{2}3\hspace{2}} \] _{{\alpha}}^{{\beta}}}$
Б@ $3$\displaystyle{- \[ \frac{\hspace{2} { $ x- {\alpha} $ }^{2} \hspace{2}}{\hspace{2}2\hspace{2}} $ {\beta}- {\alpha} $ \] _{{\alpha}}^{{\beta}}}$
$3$\displaystyle{=\frac{\hspace{2} { $ {\beta}- {\alpha} $ }^{3} \hspace{2}}{\hspace{2}3\hspace{2}}- \frac{\hspace{2} { $ {\beta}- {\alpha} $ }^{3} \hspace{2}}{\hspace{2}2\hspace{2}}}$
$3$\displaystyle{=- \frac{\hspace{2} { $ {\beta}- {\alpha} $ }^{3} \hspace{2}}{\hspace{2}6\hspace{2}}}$