bonjour
a = 5/6 + 3/4
a = 10/12 + 9/12 = 19/12
b = 5/6 + 3/4 - 2/3
b = 10/12 + 9/12 - 8/12 = 1/12
c = 35/36 x 4/7 x 9/10
c = 35 x 4 x 9 sur 36 x 7 x 10
C = 5 x 1 x 9 sur 9 x 1 x 10
C = 45/90 = 1/2
D = ( 6/5 + 4/3 - 3/2 ) x ( 1/8 - 5/3 )
D = ( 36/30 + 40/30 - 45/30 ) x ( 3/24 - 40/24 )
D = 31/30 x - 37/24
D = - 1147/720
a = 1 : 3/2
a = 1 x 2/3 = 2/3
B = 1/3 : 2
B = 1/3 x 1/2 = 1 /6
C = 1 : ( 1/2 + 1/3 )
C = 1 : ( 3/6 + 2/6)
C = 1 : 5/6
C = 1 x 6/5 = 6 /5
D = ( 3/2 - 5 /6 ) : ( 1/4 + 1/3 )
D = ( 9/6 - 5/6 ) ; ( 3/12 + 4/12 )
D = 4/6 : 7/12
D = 4/6 x 12/7
D = 8/7
allez fais le dernier pour voir si tu as compris
