Sagot :
Bonjour,
a)
(2/3)*(4/5)=(2*4)/(3*5=8/15
b)
3*(5/2)=(3*5)/2=15/2
c)
(7/20)*(-9/4)=(7*(-9))/(20*4)=-63/80
d)
(3/-7)*(6/-7)=(3*6)/(-7*(-7))=18/49
Réponse :
a. 2/3 x 4/5 = 2x4/3x5 = 8/15
b. 3 x 5/2 = 3/1 x 5/2 = 3x5/1x2 = 15/2
c. 7/20 x -9/4 = 7x(-9)/20x4 = -63/80
d.3/-7 x 6/-7 = 3x6/(-7)x(-7) = 18/49
Explications étape par étape