bonjour niveau 4e merci d avance ​

Bonsoir

a)

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

(6/5) / (2/3) =

6/5 *3/2 = 18/10 = 9/5

[1/ (6/5)  ] * [1/(2/3)]=

5/6 * 3/2 = 15/6 = 5/2

b)

7/9 * 7/9 = 49/81 = 7/9

(7/9) /(7/9)=

(7*9)* (9/7) =63/63 = 1

[1/(7/9)] *[1/(7/9)]=

9/7 * 9/7 = 81/63 = 9/7