est-ce que vous pouvez m'aidez svp? ?Je ne comprends pas ce genre de fraction

A = 2/3 + 7/6
= 2*2/3*2 + 7/6
= 4/6 + 7/6
= 11/6

B = -1/7 - 8 / 5
= -5/35 - 56/35
= -61/35

C= 18/5 + 5/3
= 54/15 + 25/15
= 79/ 15

JE TE LAISSE ESSAYER DE FAIRE LES DEUX DERNIERS POUR VOIR SI TU AS COMPRIS SI T'Y ARRIVE PAS DIS LE ^^

F= 3/8 * -5/4
= 3*(-5) / 8*4
= -15  / 32

G= -2/7 * 1/ -5
= -2 / -35

H= -2 * 4,5/7
H= - 9/7

Bonsoir
A = 2/3 + 7/6  = 4/6  +7/6 = 11/6
B = -1/7 + -8/5 = -5/35 - 56/35 = -61/35
C = -18/5 - -5/3 = -54/15 + 25/15 = - 29/15
D = -7/8 + -5 /9 = - 63/72 - 40/72 = - 103/72

F = - 15/32
G = - 2/-35 = 2/35
H = -9/7
I = -420/210 = -2
J = -150/90 = -5/30

K = -2/5
L = 8/7 x 2/21 = 16/ 147
M = -2/7 x 3/6 = - 6/42 = -1/7
N = 1/2 x 5/14 = 5/28
P = (30/7 -4 ) : -7/3 - (-3/6 - 10/-6)
P = (30/7 - 28/7) : -7/3 - ( -13/-6)
P = 2/7 : -7/3 - 13/6
P = 2/7 : (- 14/6 -13/6)
P = 2/7 : - 27/6
P = 2/7 x -6/27
P = - 12/189 = -3/63