Bonjour aidez moi silvouplais :)
Calculer les expressions et donner le résultat sous la forme la plus simple.
a) -15/7 x 14/25
b) 18 x 7/27
c)-15/28 x 21/20
d) 13/-45 x -18/26
e)77/49 x 35/-121
f) -54/81 x -63/-42

a) 3 + 7/8
b)- 3/4-3
c) -6-2/7

2

Réponses

2014-09-27T07:45:18+02:00
-15/7 X 14/25 = -210/ 175 = -42/35 = -6/5
18 X 7/27 = 126/27 = 42/ 9 = 14/3
-15/28 X 21/20 = -315 / 560 = - 63/112 = (:7) -9/16 
13/-45 X -18/26 = -234 / 1170 = (:9) -26/130 = -13/65
77/49 X 35/-121 = 2695 /-5929 = (:7) -385/847 
-54/81 X -63/-42 = +3402/-3402 = -1

3 + 7/8 = 24/8 +7/8 = 31/8
-3/4 -3 = -3/4 -12/4 = -15/4
-6 -2/7 = -42/7 -2/7 = -49/7 = - 7
2014-09-27T08:58:16+02:00
Petite erreur sur la derniere:
-6-2/7=-42/7-2/7=-44/7