on multiplie les chiffres du haut ensemble et ceux du bas ensemble
a 2/5 x 3/4 = 6/20
b 7/11 x 9/2 = 63 / 22
c 6/19 x 15 /7 = 90 / 133
d 1/2 x1/3x 1/4x1/5 = 1/120
e 3/8x 7/10 x1/5 = 21/400
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on multiplie les chiffres du haut ensemble et ceux du bas ensemble
a 2/5 x 3/4 = 6/20
b 7/11 x 9/2 = 63 / 22
c 6/19 x 15 /7 = 90 / 133
d 1/2 x1/3x 1/4x1/5 = 1/120
e 3/8x 7/10 x1/5 = 21/400