[tex] \int\limits^2_0 {(x^3-x+2)} \, dx \ \textless \ 2t ,(t\ \textgreater \ 0) [/tex],
⇒ [tex]( \frac{x^4}{4}- \frac{x^2}{2}+2x) I_{0}^2 \ \textless \ 2t, -\ \textgreater \ \frac{2^4}{4}- \frac{2^2}{2} +4-0\ \textless \ 2t -\ \textgreater \ 8\ \textless \ 2t,deci, t\ \textgreater \ 4 [/tex]
