aidez moi s'il vous plait

6x16/12 = 6 x 16/6x2 = 16/2 =8

7/14 x2 = 14/14 =1

2.3x9/3 = 2.3x3 = 6.9

4/6x42 = 4/6 x (6x7) = 4x7 = 28

7/6x3 = 7/3x2 x 3 =  7/2 = 3.5

5x7/15x3 = 5x3x7/15 = 15x7/15 = 7