bonjour

A = 7/5 x 3/2 = 21/10

B = -5/(-3) x 2 / (-7) = -5/3 x 2/7 = -10/21

C = -8 x 7/6 = -8/1 x 7/6 = - 56/6 = -28/3

D = 11/10 / 3/4 = 11/10 x 4/3 = 44/30

E = -1/2 / 5/(-6) = 1/2 x 6/5 = 3/5

F = -5/9 / -2/(-7) = -5/9 x 7/2= -35/18

G = 7/9 / 12 = 7/9 x 1/12 = 7/108

H = 3 / 5/7 = 3/1 x 7/5 = 21/5

diviser par une fraction revient à multiplier par son inverse.

I = 7/8 x 7/2 - 5/4 x 9/4 = 49/16 - 45/16 = 4/16

J = (7/6)² - 11/18 / 2 = 7²/6² - 11/18 x 1/2 = 49 / 36 - 11 / 36 = 38/36 = 2x19/2x18= 19/18

:)