BONJOUR calculer les fractions ci-dessous A- 5/6 + 2/3 B- 3/4 + (-3)/16 C- 8/35 + (-4)/5 calculer: A- 5/2+3/4+(-7)/8 B- 4/15+2/5-7/30

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.