Réponse :
bonjour
A = ( 1/8 - 7/12) + ( 7/6 + 7/16)
A = ( 3/24 - 14/24)+ ( 56/48 + 21/48)
A = - 11/24 + 77/48
A = - 22/48 + 77/48 = 55/48
B = 1/8 - 7/12 : 7/6 + 7/16
B = 1/8 - 7/12 x 6/7 + 7/16
B = 1 /8 - 42/84 + 7/16
B = 1/8 - 1/2 + 7/16
B = 2/16 - 8/16 + 7/16 = 1/16
C = ( 1/8 + 7/12) : ( 5/6 - 4/15)
C = ( 3/24 + 14/24) : ( 25/30 - 8/30)
C = 17 /24 : 17/ 30
C = 17/24 x 30 /17 = 510/408 = 5/4
D = ( 1/8 + 7/12) x ( 6/5 - 15/4 )
D = ( 3/24 + 14/24) x ( 24/20 - 75/20)
D = 17/24 x ( - 51/20 )
D = - 687/480 = - 229 /160
Explications étape par étape
