Fraction 3- 5sur7 5x 11sur4 5sur6 / 7sur3 en détaillant les calculs

3 - 5/7 
= 3 x 7 / 1 x 7 - 5/7
= 21/7 - 5/7
= 16/7

5 x 11/4
= 55/4

5/6 : 7/3
= 5/6 x 3/7
= 15/42
= 3 x 5 / 3 x 14
= 5/14