Réponse :
Explications étape par étape :
bonjour
x = 5
y = 2/7
z = -3/4
a 1/y = 1 / (2/7) = 7/2
b x / y = 5 / (2/7) = 5 × 7/2 = 35/2
c 2y / z = 2(2/7) / (-3/4) = 4/7 × 4/(-3) = - 16/21
d z/ (-3)x = (-3/4) / (-3)x = (-3/4) × ( - 1/3)x = 1/4x
e 1/x - 1/z = 1/5 - 1/ (-3/4) = 1/5 + 4/3 = 3/15 +20/15 = 23/15
f (x +y) / z = (5 +2/7)/ ( -3/4) = (35/7 +2/7) × (-4/3) = 37/7 × (-4/3)= ( - 148/21)
g y /(z - x) = (2/7) / ( (-3/4 - 5) = (2/7) / ( -3/4 - 20/4) = (2/7) / (-23/4) = (2/7)× (- 4/23)=
(- 8/161)
