Bonsoir, je coince sur les fractions de l'exercice 2. Je suis en 4ème. Quelqu'un pourrait m'expliquer svp? Merci d'avance

Par exemple c'est comme ca

Bonsoir,

A = 14/3 : 35/10
A = 14/3 x 10/35
A = 14/35 x 10/3
A = (2 x 7)/(5 x 7) x 10/3
A = 2/5 x 10/3
A = 10/5 x 2/3
A = 2 x 2/3
A = 4/3

B = 7/6 - 5/6 x 4/3
B = 7/6 - 5/3 x 4/6
B = 7/6 - 5/3 x (2 x 2)/(2 x 3)
B = 7/6 - 5/3 x 2/3
B = 7/6 - 10/9
B = 21/18 - 20/18
B = 1/18

C = (3 + 1/3)^2
C = (9/3 + 1/3)^2
C = (10/3)^2
C = 100/9

D = (6 x 10^9 x 3 x 10^(-3)) / (8 x 10^3 x 9 x 10^2)
D = (6 x 3)/(8 x 9) x (10^(9-3-3-2))
D = 6/8 x 3/9 x 10^1
D = (2 x 3)/(2 x 4) x 3/(3 x 3) x 10
D = 3/4 x 1/3 x 10
D = 1/4 x 10
D = 10/4
D = 5/2