Répondre :
Bonsoir
B = -15/18 + 14/18= -1/18
C = 504/72 = 7
D = 2/9 +5/3 : 15/4 = 2/9 +5/3 x 4/15 = 2/9 x 4/9 = 8/81 = 1/9
E = (4 -2/5) x (3/4 - 2/3) = (20/5 -2/5) x ( 9/12 -8/12) = 18/5 x 1/12 = 18/60 = 3/10
B = -15/18 + 14/18= -1/18
C = 504/72 = 7
D = 2/9 +5/3 : 15/4 = 2/9 +5/3 x 4/15 = 2/9 x 4/9 = 8/81 = 1/9
E = (4 -2/5) x (3/4 - 2/3) = (20/5 -2/5) x ( 9/12 -8/12) = 18/5 x 1/12 = 18/60 = 3/10