Bonjour de l'aide svp merci Soit les nombres r= 3/7, s = 5/6 et t = 14/5 Calculer et simplifier A = r + s + t B = r - s - t C = r x s x t D = ( r x s ) diviser

bonjour

a = 3/7 + 5/6 + 14/5
a = 90/210 + 175/210 + 588/210
a = 853/210

b = 3/7 - 5/6 - 14/5
b = 90/210 - 175/210 - 588/210
b = - 673/210

c = 3/7 x 5/6 x 14/5 
c = 210/210 = 1

d = ( 3/7 x 5/6) : 14/5
d = 15/42 : 14/5
d = 15/42 x 5/14 
d = 75/588

e = 3/7 : ( 5/6 x 14/5)
e = 3/7 : 70/30
e = 3/7 : 7/3
e = 3/7 x 3/7 = 9/49