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