6 x 5 x 5/7 x 7/6 = 4/3 x 9 = 5/8 x 2/5 x 8 = Merci d'avance

6 x 5 x 5/7 x 7/6
= (6 x 5 x 5 x 6)/(7 x 6)
= (6 x 5 x 5)/7
= 150/7

4/3 x 9
= 36/3
= 12

5/8 x 2/5 x 8
= (5 x 2 x 8)/(8 x 5)
= 2