Bonjour,
A= 1/2 + 5/8
= 4/8 + 5/8
= 9/8
B= 1/6 - 20/6
= 19/6
C=
(-6/8 +7/8) * ( -2/15 - 3/15)
= 1/8 * -5/15
= 1/8 * - 1/3
= -124
D=
(2/14 -3/14) * (-6/4)
= -1/14 * -3/2
= 3/ 28
E=
7/15 +3/10 = 14/30 + 9/30 = 23/30
23/30 * 1/2
= 23/ 15
F=
1/6+3/4 = 2/12 + 9/12 = 11/12
1/6 -1/4 = 2/12 - 3/12 = -1/12
(11/12) /(-1/12)
= 11/12* -12 = -132/12 = -11
