Bonjours pouvez vous medais combien fais ?: 6-4sur3 / -25sur4x(-2sur5 ) / 2sur3+5sur7 / / 2sur21x(2sur5+3sur10)

Réponse :

Bonjour

Explications étape par étape

6-4sur3 = 6 - 4/3 = 18/3 - 4/3 = 14/3

-25sur4x(-2sur5 ) = -25/4 x -2/5 = 25/5 x 2/4 = 5 x 1/2 = 5/2

2sur3+5sur7 = 2/3 + 5/7 = 14/21 + 15/21 = 29/21

2sur21x(2sur5+3sur10) = 2/21 x (2/5 + 3/10) = 2/21 x (4/10 + 3/10) = 2/21 x 7/10 = 2/10 x 7/21 = 1/5 x 1/3 = 1/15

Bonjour,

6-4/3

= (6 x 3) / (1 x 3) - 4/3

= 18/3 - 4/3

= 14/3

-25/4 x (-2/5)

= 50/20

= (10 x 5) / (10 x 2)

= 5/2

2/3 + 5/7

= (2 x 7) / (3 x 7) + (5 x 3) / (7 x 3)

= 14/21 + 15/21

= 29/21

2/21 x (2/5 + 3/10)

= 2/21 x [(2 x 2) / (5 x 2) + 3/10]

= 2/21 x (4/10 + 3/10)

= 2/21 x 7/10

= 14/210

= (14 x 1) / (14 x 15)

= 1/15