Réponse :
Explications étape par étape
Bonsoir
45/14 x 49/60
= 49/14 x 45/60
= (7 x 7)/(7 x 2) x (3 x 15)/(4 x 15)
= 7/2 x 3/4
= 21/8
5/3 x 4/5
= 5/5 x 4/3
= 4/3
45/26 x 65/72
= 45/72 x 65/26
= (9 x 5)/(9 x 8) x (13 x 5)/(13 x 2)
= 5/8 x 5/2
= 25/16
2 x 9/6
= 2 x (3 x 3)/(3 x 2)
= 2 x 3/2
= 2/2 x 3
= 3
7/6 x 6/7
= 7/7 x 6/6
= 1
25 x 11/50
= 11 x 25/50
= 11 x 25/(25 x 2)
= 11/2