Bonjour,
a.
1/4 + 1/4 + 1/4 + 1/4 = 4/4 = 1 donc 4 x 1/4 = 1
b.
4/3 + 4/3 + 4/3 = (4+4+4)/3 = 12/3 = 4 donc 3 x 4/3 = 4
conclusion b x a/b = a
c.
2/5 + 2/5 + 2/5 = (2+2+2)/5 = 6/5 donc 3 x 2/5 = (3x2)/5 = 6/5
d.
2/3 + 2/3 + 2/3 + 2/3 = (2+2+2+2) / 3 = 8/3
conclusion c x a/b = (cxa)/b
