Réponse :
effectue les calculs et donne le résultat sous la forme d'une fraction simplifiée
a) 2/3 ÷ 5 = 2/3/5/1 = 2/15
b) - 4/45 ÷ 16/15 = - 4 x 15/45 x 16 = 1/12
c) 12 ÷ 3/4 = 12 x 4/3 = 16/1
d) 8/-15 ÷ - 4/54 = 8 x 54/- 15 x - 4 = 36/5
e) 5/6 ÷ 7/-11 = 5 x -11/6 x 7 = - 55/42
f) - 15/8 ÷ 25/-12 = - 15 x (-12)/8 x 25 = 9/10
Explications étape par étape :
Explications étape par étape:
Exercise 7:
a) (2/3)/5 = 2/(3x5)
= 2/15
b) (-4/45)/(16/15) = (-4/45)x(15/16)
= - 60/720
= -1/12
c) 12/(3/4) = 12x(4/3)
= 48/3
= 16
d) (8/-15)/(-4/54) = (-8/15)/(-4/54)
= (-8/15)x(-54/4)
= 432/40
= 54/5
e) (5/6)/(7/-11) = (5/6)/(-7/11)
= (5/6)x(-11/7)
= -55/42
f) (-15/8)/(25/-12) = (-15/8)/(-25/12)
= (-15/8)x(-12/25)
= 180/200
= 9/10