Réponse :
Ex 14 :
A) 2/7 + 3/14 - 1/21 = 4/14 + 3/14 - 1/21 = 7/14 - 1/21 = 21/42 - 2/42 = 19/42
B) 5/6 - 19/3 + 7/18 = 5/6 - 38/6 + 7/18 = -33/6 + 7/18 = -99/18 + 7/18 = -92/18 = -46/9
C) 7/4 + 1/16 - 9/2 = 28/16 + 1/16 - 72/16 = -43/16
Explications étape par étape
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Réponse :
Ex 14 :
A) 2/7 + 3/14 - 1/21 = 4/14 + 3/14 - 1/21 = 7/14 - 1/21 = 21/42 - 2/42 = 19/42
B) 5/6 - 19/3 + 7/18 = 5/6 - 38/6 + 7/18 = -33/6 + 7/18 = -99/18 + 7/18 = -92/18 = -46/9
C) 7/4 + 1/16 - 9/2 = 28/16 + 1/16 - 72/16 = -43/16
Explications étape par étape