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Réponse:

61 A 7/5 - 21/10 = 14/10 - 21/10 = - 7/10

61 B ( 36/15 + 10/15 ) 5/2 = 46/15 X 5/2 = 230/30 = 23/3

61 C 385/165 = 3/18 = 7/3 + 3/18 = 7/3 + 1/6 = 14/6 + 1/6 = 15/6 = 5/2

61 D 19/5 - 12/15 = 19/5 - 4/5 = 15/5 = 3

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