je n y comprends vraiment rien j ai besoin de votre aide c est l ex 2

a) 3/2 x10 = 1,5x10 = 15
   3/2 x 10 = 3/2 x 2x5 = 3x5 = 15
   3/2 x10 = 30/2 = 15

b)
5/4 x120 = 5/4 x 4x30 = 5x30 = 150
2/3 x 333 = 2/3 x3x111 = 2x111 = 222

3/2 x10 = 30/2 =15
3/2 x5x2 = 15/2 x2 = 15
3/2 x10 = 1.5 x10 = 15

120x5/4 = 600/4 = 150

333x2/3 = 111x2 = 222