Bonjour

Calculer en simplifiant le résultat.

A =4/15×3/4-13/15

A = 12/60 - (13 x 4) / (15 x 4)

A = 12/60 - 42/60

A = - 30/60

A = (30 x - 1) / (30 x 2)

A = - 1/2

B=;2/9-1/9×4/5

B = (2 x 5) / (9 x 5) - 4/45

B = 10/45 - 4/45

B = 6/45

B = (3 x 2) / (3 x 15)

B = 2/15

C = 12 x (5/8-1/4)

C = 12 x [5/8 - (1 x 2) / (4 x 2)]

C = 12 x (5/8 - 2/8)

C = 12 x 3/8

C = 36/8

C = (4 x 9) / (4 x 2)

C = 9/2

D =(3/5-3/25)×5/4+1

D = [(3 x 5) / (5 x 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 = (20 x 3) / (20 x 5) + (1 x 5) / (1 x 5)

D = 3/5 + 5/5

D = 8/5

E=3+-2/3×3/-4×4/5×5/-6

E = 3 + 6/12 x - 20/30

E = 3 + (6 x 1) / (6 x 2) x (10 x - 2) / (10 x 3)

E = 3 + 1/2 x - 2/3

E = (3 x 6) / (1 x 6) - 2/6

E = 18/6 - 2/6

E = 16/6

E = (2 x 8) / (2 x 3

E = 8/3

F=-4/9×27/12+16/8×-5/4

F = - 108/108 - 80/32

E = - 1 - (16 x 5) / (16 x 2)

E = (- 1 x 2) / (1 x 2) - 5/2

E = - 2/2 - 5/2

E = - 7/2.