link des lecons

grade 8 :

http://www.4shared.com/dir/25782942/92a4141e/devoir_grade_8.html
grade 9 :


http://www.4shared.com/dir/25793900/9d1afee3/devoir_grade_9.html



grade 10 :


http://www.4shared.com/dir/25781050/78d5d012/sharing.html