Effectuer les multiplications et simplifier les produits : A) 18/10 x 5/18 b) 13/4 x 4/8 x 4/13. C)13/25 x 10/12 x 5/13

A) 18/10 x 5/18
= 90/180
= 90 x 1 / 90 x 2
= 1/2

b) 13/4 x 4/8 x 4/13
= 52/32 x 4/13
= 208/416
= 208 x 1 / 208 x 2
= 1/2

C)13/25 x 10/12 x 5/13
= 130/300 x 5/13
= 650/3900
= 650 x 1 / 650 x 6
= 1/6

A) 18/10 * 5/18 = 9*2/5*2 * 5/18 = 9*5/18*5 = 9/18. B) 13/4 * 4/8 * 4/13 = 13*4*4/4*8*13 = 4/2. C) 13/25*10/12*5/13 = 13*10*5/25*12*13 = 5*2*5/5*5*13 = 2/13