Bonjour,
6/7 = (6*100)/ (7*100) =600/700
800/900 = (800/100) / (900/100) = 8/9
9/5 = (9*30) / (5*30) = 271/150
36/45 = (36/9)/ (45/9) = 4/5
11/13 = (11*5)/(13*5) = 55/65
420/280 = (420/20) /(280/20) = 21/14
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Bonjour,
6/7 = (6*100)/ (7*100) =600/700
800/900 = (800/100) / (900/100) = 8/9
9/5 = (9*30) / (5*30) = 271/150
36/45 = (36/9)/ (45/9) = 4/5
11/13 = (11*5)/(13*5) = 55/65
420/280 = (420/20) /(280/20) = 21/14