bonjour
produits en croix
a ) 7 x = 20
x = 20/7
b ) 45 x = 9
x = 9/45 = 1 /5
c) 25 x = 21
x = 21/25
d ) 8 x = 170
x = 170/8 = 85 /4
e) 5 x = 144
x = 144/5
f) 8 x = 27
x = 27/ 8
