http://www.math7.korasat.com/13.htm

http://www.anissmaths.123.fr/3AC/3AC/Dorosse/s1/001.pdf

http://www.anissmaths.123.fr/3AC/3AC/E/s1/pdf/01tq.pdf

http://www.anissmaths.123.fr/3AC/3AC/E/s1/pdf/01da.pdf

bon courage