DM URGENT DE MATH POUR DEMAIN Détaillez vos calculs svp :) et merci d'avance :p

A= 8/5 + 2/5 x 1/2
A= 8/5 + 2/10
A= 8x2/5x2 +2/10
A=16/10 +2/10
A=18/10
A=9/5

B=3/5 x 2/5 + 7/10
B=6/25 +7/10
B= 6x2/25x2 + 7x5/10x5
B=12/50 + 35/50
B=47/50

C= 1/2 -6/10 x 3/2 - 1/7
C= 1x7/2x7 - 1x2/7x2 - 18/20
C=7/14 - 2/14 - 9/10
C=5/14 -9/10
C= 5x5/14x5 -9x7/10x7
C= 25/70 - 63/70
C= -38/70

D= 4/25 -( 12/30 + 1/5 )
D= 4/25 - (12/30 +1x6/5x6)
D= 4/25 - ( 12/30 + 6/30 )
D= 4/25  - 18/30
D= 4/25 - 3/5
D = 4/25 - 3x5/5x5
D= 4/25 -15/25
D= -11/25

E= 4/15 -7/10 + 2/5
E= 4/15 - 7/10 + 2x2/5x2
E= 4/15 - 7/10 + 4/10
E= 4/15 -3/10
E= 4x2/15x2 - 3x3/10x3
E= 8/30 - 9/30
E= -1/30

F= ( 2-7/6 )/ 3- 7/6
F= ( 2x6/6 -7/6) / 3x6/6 - 7/6
F= ( 12/6 -7/6 ) / 18/6 -7/6
F= 5/6 x 6/11
F= 30/66
F= 5/11

Voilà !