Bonjour pouvez vous m'aider svp à résoudre ce problème merci pour ce qui m'aide calculer et donner le résultat sous la forme d'une fraction simplifier. ​

Réponse :

A = 2/9 + 3/72 = (2*8)/(9*8) + 3/72 = 18/72 + 3/72 = 21/72 = (7*3)/(24*3) = 7/24

B = 7/8 - 12/72 = (7*9)/(8*9) - 12/72 = 63/72 - 12/72 = 51/72 = (3*17)/(3*24) = 17/24

C = 7/2 - 67/20 = (7*10)/(2*10) - 67/20 = 70/20 - 67/20 =3/20

D = 3/6 + 17/60 = (3*10)/(6*10) + 17/60 = 30/60 + 17/60 = 47/60

E = 12/9 X 3/36 = 36/324 = (9*4)/(9*36) = 4/36 = (2*2)/(2*18) = 2/18 = (2*1)/(2*9) = 1/9

G = 12/16 X 28/39 = 336/624 = (6*56)/(6*14) = (56/14) = (2*28)/(2*7) = 28/7 = 4

Explications :

A= 2/9+3/72

=8×2/8×9 + 3/72

=16/72 + 3/72

=19/72

B=7/8 - 12/72

=7×9/8×9 - 12/72

=36-12/72

=24/72

=1/3

C=7/2 - 67/20

=7×10/2×10 - 67/60

=70-67/200

=3/20

D=3/6 +7/60

=3×10/6×10 + 7/60

=30+7/60

=37/60

E=12/9 × 3/36

=36/324

=2/9

F=7/8 × 24/40

=168/320

=84/160

=21/40

G=13/10 × 28/30

=364/300

=91/75