Réponse :
Bonsoir
Explications étape par étape
A = 4/15 X 3/4 -13/15
A = 12/60 -13/15
A = 12/60 -13/15 X 4/4
A = 12/60 - 52/60
A = 40/60 = 4/6 = 2/3
B = 2/9 -1/9 X 4/5
B = 2/9 -4/45
B = 2/9 X 5/5 -4/45
B = 10/45 -4/45
B = 6/45
C = 12 X (5/8 -1/4)
C = 12 X (5/8 X 4/4 -1/4 X 8/8)
C = 12 X ( 20/32 -8/32)
C = 12 X 12/32=
C = 144/32
C = 72/16 = 36/8 = 18/4 = 9/2
D = (3/5 -3/25) X 5/4 +1
D = (3/5 X 5/5 -3/25) X 5/4 +1
D = (15/25 -3/25) X 5/4 +1
D = 12/25 X 5/4 +1
D = 60/100 +1
D = 6/10 +1 X 10/10
D = 6/10 +10/10
D = 16/10 = 8/5
E = 3 + -2/3 X 3/-4 X 4/5 X 5/-6
E = 3 -6/-12 X 4/5 X 5/-6
E = 3 +6/12 X 4/5 X 5/-6
E = 3 +24/60 X 5/-6
E = 3 +120/-360
E = 3 + 12/-36
E = 3 X 36/36 +12/-36
E = 108/36 +12/-36 = 96/ -36 = 32/-12 = 18/-6 = -3
F = -4/9 X 27/12 +16/8 X -5/4
F = - 108/108+ -80/32
F = -1 -5/2
F = -2/2 -5/2 = -7/2
