Bonjour,
A= -1/2 + 5/12
A= -1*6/2*6 + 5/12
A= -6/12 + 5/12
A= -1/12
B= -5/-10 — 3/4
B= -5*2/-10*2 — 3*5/4*5
B= -10/-20 — 15/20
B= -5/20
B= -5:5/20:5
B= -1/4
C= -6/7 + 8
C= -6/7 + 8/1
C= -6/7 + 8*7/1*7
C= -6/7 + 56/7
C= 50/7
D= 1/-2 — -5/3
D= 1*3/-2*3 — -5*2/3*2
D= 3/-6 — -10/6
D=7/6
E= -4/3 — 1/6 + 7/24
E= -4*8/3*8 — 1*4/6*4 + 7/24
E= -32/24 — 4/24 + 7/24
E= -36/24 + 7/24
E= -29/24
