Bonjour,
(6 + 12)/(7 + 12) = 18/19 = (19 - 1)/19 = 19/19 - 1/19 = 1 - 1/19
Réponse B
3/2 + 7/3 = 9/6 + 14/6 = 23/6
Réponse C
3/2 + 11/5 x 15/5 = 3/2 + 11/5 x 3 = 3/2 + 33/5 = 15/10 + 66/10 = 81/10
(3/10 - 2/5) x 1/2 = (3/10 - 4/10) x 1/2 = -1/10 x 1/2 = -1/20
(3 - 5/2)/(2/7 - 7/2) = (6/2 - 5/2)/(4/14 - 49/14) = 1/2 / -45/14 = 1/2 x -14/45 = -7/45
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Bonjour,
(6 + 12)/(7 + 12) = 18/19 = (19 - 1)/19 = 19/19 - 1/19 = 1 - 1/19
Réponse B
3/2 + 7/3 = 9/6 + 14/6 = 23/6
Réponse C
3/2 + 11/5 x 15/5 = 3/2 + 11/5 x 3 = 3/2 + 33/5 = 15/10 + 66/10 = 81/10
(3/10 - 2/5) x 1/2 = (3/10 - 4/10) x 1/2 = -1/10 x 1/2 = -1/20
(3 - 5/2)/(2/7 - 7/2) = (6/2 - 5/2)/(4/14 - 49/14) = 1/2 / -45/14 = 1/2 x -14/45 = -7/45