\input zb-basic
\input zb-matheduc
\iteman{ZMATH 1992h.00305}
\itemau{Arndt-Adam, E.; Doebling, H. (Studienkreis GfM, Bochum (Germany))}
\itemti{Grade 7. Proportional functions and rule of three. Klasse 7. Zuordnungen und Dreisatz. Realschule/Gymnasium/Gesamtschu le.}
\itemso{1992. 40 p. Available from Studienkreis GfM, Bochum (Germany). Ser. Title: Mathehelfer.}
\itemab

\itemrv{~}
\itemcc{F80 U93}
\itemut{Proportion; Inverse Proportion; Grade 7; Intermediate Schools; Gymnasium; Comprehensive Schools; Revision Books; Remedial Teaching; ; Proportionalitaet; Antiproportionalitaet; Klasse 7; Realschule; Gymnasium; Gesamtschule; Repetitorium; Foerderunterricht}
\itemli{}
\end