Setze in das Polynom 2 X 3 − 1 4 X 2 + 2 5 X + 3 4 {\displaystyle {}2X^{3}-{\frac {1}{4}}X^{2}+{\frac {2}{5}}X+{\frac {3}{4}}} die Zahl 2 3 {\displaystyle {}{\frac {2}{3}}} ein.
