Bonjour pouvee vous m'aider svp Merci d'avance A = 7/4 + 2/3 ×15/8 B= (3-3/5)÷(-2/3-4/5)

Coucou

A = 7/4 + 2/3 x 15/8

= 7/4 + (2 x 15) / (3 x 8)

= 7/4 + (2 x 3 x 5) / (3 x 2 x 4)

= 7/4 + 5/4

= (7 + 5) / 4

= 12 / 4

= (3 x 4) / 4

= 3

B = (3 - 3/5) / (-2/3 - 4/5)

= [ (3 x 5) / (1 x 5) - 3/5 ] / [ (-2 x 5) / (3 x 5) - (4 x 3) / (5 x 3) ]

= [ 15/5 - 3/5 ] / [ -10/15 - 12/15 ]

= [ (15 - 3) / 5 ] / [ (-10 - 12) / 15 ]

= (12 / 5) / (-22 / 15)

= (12 / 5) x (15 / -22)

= (12 x 15) / (5 x -22)

= - (2 x 6 x 3 x 5) / (5 x 11 x 2)

= - (18 / 11)

Voilà j'espère avoir pu t'aider ^^

N'hésite pas si tu as des questions :)