Bonsoir,
M=
7/8 * 3/3 - 1/12 * 2/2
= 21/24 - 2/24
= 19/24
N=
-4/9 * 4/4 + 5/12 * 3/3
= -16/ 36 + 15/36
= -1/36
P=
-7/6 * 3/3 - 5/3 * 6/6 + 2/9 *2/2
= -21/18 - 30/18 + 4/18
= -47/18
Q= ( 4/3 * 5/5 + 2/15 ) - ( 3/4 * 2/2 -1/8)
= (20/15 +2/15 ) -( 6/8 -1/8)
= 22/15 - 5/8
= 22/15 *8/8 - 5/8 * 15/15
= 176/120 - 75/120
= 101/120
