2 x ? = 1
? = 1/2
? x 10 = 1
? = 1/10
5 x ? = 1
? = 1/5
3 x ? = 1
? = 1/3
? x 0 = 1 impossible
3/4 x ? = 1
? = 1 x 4/3 = 4/3
inverse de 4 => 1/4
inverse de 8 et 7 : tu as compris
inverse 9/11 = 11/9
