salut,
a.4-3/2 = (4 x 2) / (1 x 2) - 3/2 = 8/2 - 3/2 = 5/2
b.2-1/3 = (2 x 3) / (1 x 3) - 1/3 = 6/3 - 1/3 = 5/3
c.9/4-1 = 9/4 - (1 x 4) / (1 x 4) = 9/4 - 4/4 = 5/4
d.7+1/4 = (7 x 4) / (1 x 4) + 1/4 = 28/4 + 1/4 = 29/4
e.16/3-3 = 16/3 - (3 x 3) / (1 x 3) = 16/3 - 9/3 = 7/3
A toi de continuer, tu as sûrement compris le principe...
Recopie et complète
a. 9/7+8/17=17/7
b.14/15 +3/5=23/15
3/5 = (3 x 3) / (5 x 3) = 9/15 et 23/15 - 9/15 = 14/15
c.3/4+5/24=23/24
3/4 = (3 x 6) / (4 x 6) = 18/24 et 23/24 - 18/24 = 5/24
d.9/7-8/7=1/7
e.5/8- 11/20 =3/40
5/8 = (5 x 5) / (8 x 5) = 25/40 et 25/40 - 3/40 = 22/40 = (2 x 11) / (2 x 20) = 11/20
