Bonjour
a) 14/25 x 5/7
= (14 x 5) / (25 x 7)
= (2 x 7 x 5) / (5 x 5 x 7)
= 2/5
b) 5/6 + 3/7 x 7/(-3)
= 5/6 + (3 x 7) / (7 x -3)
= 5/6 + (-1)
= 5/6 - 6/6
= -1/6
c) (1/6 + 1/3) x (5/8 - 1/4)
= (1/6 + (1 x 2)/(3 x 2)) x (5/8 - (1 x 2)/(4 x 2))
= (1/6 + 2/6) x (5/8 - 2/8)
= 3/6 x 3/8
= (3 x 3)/(6 x 8)
= (3 x 3)/(2 x 3 x 8)
= 3/16
d) (737 x (-521)) / -3.1
= -383 977 / -3.1
= 383 977 / 3.1
Voilà j'espère avoir pu t'aider ^^
