Bonjour,
5/7 + (2/7 - 35/7)
= 5/7 - 33/7
= -28/7
= -4
(3/3 )/ 2/5
= 1/(2/5)
= 1*5/2
= 5/2
4/5 * ( 5/4 +4/4) -3/10
= 4/5 * 9/4 -3/10
= 36/20 -3/10
= 18/10 - 3/10
= 15/10
= 3/2
