Bonsoir il faut calculer et doner le resultat sous forme simplifié a) 2×(3sur5+4sur6) b) 7sur5 - 3sur10+ 3sur5 c) 3- 7

Bonsoir,

a) 2 x (3/5 + 4/6)
= 2 x (3 x 6 / 5 x 6 + 4 x 5 / 6 x 5
= 2 x (18/30 + 20/30)
= 2 x 38/30
= 76/30
= 2 x 38 / 2 x 15
= 38/15

b) 7/5 - 3/10 + 3/5
= 7 x 2 / 5 x 2 - 3/10 + 3 x 2 / 5 x 2
= 14/10 - 3/10 + 6/10
= 20/10 - 3/10
= 17/10

c) 3 - 7/5 + 3/5
= 3 x 5 / 1 x 5 - 7/5 + 3/5
= 15/5 - 7/5 + 3/5
= 18/5 - 7/5
= 11/5