Bonjour
Calculer les fractions ci-dessous
A- 5/6 + 2/3
= 5/6 + (2 x 2) / (3 x 2)
= 5/6 + 4/6
= 9/6
= (3 x 3) / (3 x 2)
= 3/2
B- 3/4 + (-3)/16
= (3 x 4) / (4 x 4) - 3/16
= 12/16 - 3/16
= 9/16
C- 8/35 + (-4)/5
= 8/35 - (4 x 7) / (5 x 7)
= 8/35 - 28/35
= - 20/35
= (5 x - 4) / (5 x 7)
= - 4/7
Calculer :
A- 5/2+3/4+(-7)/8
= (5 x 4) / (2 x 4) + (3 x 2) / (4 x 2) - 7/8
= 20/8 + 6/8 - 7/8
= 26/8 - 7/8
= 19/8
B- 4/15+2/5-7/30
= (4 x 2) / (15 x 2) + (2 x 6) / (5 x 6) - 7/30
= 8/30 + 12/30 - 7/30
= 20/30 - 7/30
= 13/30.
