Svp aidez moi je trouve pas le calcul, merci beaucoup.

Bonjour,

a)

3-2/3 = 9/3 -2/3 = 7/3

4/3*7 = 28/3

(7/3)/ (28/3) =  7/3 * 3/28 = 7/28  = 1/4

b)

(2/3)/ (5/6) = 2/3 * 6/5 = 12/15 =  4/5

4/5 - 2/5 =2/5

c)

-3/4 +1/2 = -3/4 + 2/4 = -1/4

2/5 -5/2 = 4/10 - 25/10 = -21/10

(2/5) / ( -21/10) = 2/5 * (-10/21) = -20/105 = -4/21