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2013-03-09T18:03:25+01:00
2013-03-09T18:35:49+01:00

34:

A-    7/3 * 3/7 = 21/21         d'ou 7/3 * 3/7 = 1

B-    4/5 * 5/4 =1

C-    6/11 * 11/6 =1