Bonjour pouvez vous m'aider sur ces excercices en détaillant les calculs comment faire je dois détaillé ex n°46,47,48,49 et le 54 mais uniquement le petit d,e,f merci
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Bonjour,
46)
a. 2/3 = (2 x 3) / (3 x 3) = 6/9
b. 4/9 - 2/3 = 4/9 - 6/9 = - 2/9
47)
a. 7/5 = (7 x 4) / (5 x 4) = 28/20
b. 7/5 + 9/20 = 28/20 + 9/20 = 37/20
48)
a. -5/14 - 3/7 = 5/14 - (3 x 2) / (7 x 2) = 5/14 - 6/14 = - 1/14
b. 2/9 - 5/27 = (2 x 3) / (9 x 3) - 5/27 = 6/27 - 5/27 = 1/27
c. - 3/20 - 2/5 = - 3/20 - (2 x 4) / (5 x 4) = - 3/20 - 8/20 = - 11/20
49)
a. 3/4 - 11/12 = (3 x 3) / (4 x 3) - 11/12 = 9/12 - 11/12 = - 2/12 = (2 x - 1) / (2 x 6) = - 1/6
b. 3/4 + 11/12 = 9/12 + 11/12 = 20/12 = (4 x 5) / (4 x 3) = 5/4.
c. 5/6 - 7/18 = (5 x 3) / (6 x 3) - 7/18 = 15/18 - 7/18 = 8/18 = (2 x 4) / (2 x 9) = 4/9.
54)
d. 1 + 2/9 = (1 x 9) / (1 x 9) + 2/9 = 9/9 + 2/9 = 11/9
e. 1 - 7/3 = (1 x 3) / (1 x 3) - 7/3 = 3/3 - 7/3 = - 4/3
f. 3 + 3/4 = (3 x 4) / (1 x 4) + 3/4 = 4/4 + 3/4 = 7/4.