Réponse :
Bonsoir
Explications étape par étape
A = 7x6/6x4 -5x4/6x4 -6x4/6x4 =
42/24-20/24 -24/24 = 42/24-44/24 =-2/24
A = - 1/12
B = -3x(-26) /13x9 =-1x(-2)/1x3 = -2/3
C = 1/1 x(-1/3 )x36/15 =
C= 1x(-1) x12/15 = -1x4/5 = - 4/5
D = 2/7 x 5/2 = 5/7
F = 5x3/6x3 -23/18 x -12/7 = -8/18 x -12/7 = -4/9 x -12/7 =
-4/3 x -4/7 = 16/21
