Bonjour,
N= 8/5 + 28/25
= 40/25 + 28/25
= 68/25
P= 53/30 - 12/10
= 53/30 - 36/30
= 17/30
Q= 49/12 - 3/2
= 49/12 - 18/12
= 31/12
R= 3/7 +( 34/28 - 23/28 )
= 3/7 + 11/28
= 12/28 +11/28
= 23/28
S= 15/5 *4/5
= 3* 4/5
= 12/5
T= 53/30 - 9/30 + 27/30
= 71/30
U= 7/6 * 4/2
= 7/6 * 2
= 14/6 = 7/3
V= 12/28 + 34/28 - 23/28
= 23/28