Bonjour
Calculer et simplifier le résultat lorsque c'est possible:
a) -3/7 + 5/7 = (-3 + 5)/7 = 2/7
b) (-3/2)x7/2 = (-3 x 7)/(2 x 2) = 21/4
c) 4/-3 x -9/8 = -9/3 x -4/8 = (3 x 3)/3 x 4/(4 x 2) = 3 x 1/2 = 3/2
d) 2/5 - 3/4 = (2 x 4)/(5 x 4) - (3 x 5)/(4 x 5) = 8/20 - 15/20 = -7/20
