Réponses

2014-04-17T19:09:59+02:00
Bonsoir

7/3 -3/7 = 49/21 - 9/21 = 40/21

10/33 - 3/22 = 20/66 - 9/66 = 11/66  = 1/6

22/49 x 25/33 x 28/15
tu les simplifies d'abord
2/7 x 5/3 x 4/3 = 40/63

21/32 : 35/48 = 21/32 x 48/35
tu simplifies avant
3/2 x 3/5 = 9/10

5/7 + 8/7 : 6/5
5/7 + 8/7 x 5/6
5/7 + 40/42 = 30/42 + 40/42 = 70/42  = 5/3

(5 -2/3) ; (1/6 + 2/9)
(15/3 - 2/3) : ( 3/18 + 4/18)
13/3 : 7/18
13/3 x 18/7 = 78/7




2014-04-17T19:14:06+02:00
A = 7/3 -3/7 = 7*7/ 21 - 3*3 / 21 = 49/21 -9/21 = 40/21

b = 10/33-3/22 = 10*2 /66 - 3*3 / 66 = 20/66 -9/66 = 11/66

c = 22/49 x 25/33 x 28/15 = 22x 25 x28 / 49x 33 x 15
=11*2 x 5*5 x 7*4 / 7*7 x 11*3 x5*3
= 2*5*4 / 7*3*3 = 40/63

d = 21/32  : 35/48 = 21/32 x 48/25 = 7*3*8*6/8 *4*5*5 = 7*3*6 / 4*5*5 = 126/100

e = 5/7+8/7 : 6/5
e = 13/7 : 6/5
e = 13/7 x 5/6
e = 13*5 / 7*6 = 65 /42

f = ( 5 -2/3) : ( 1/6 +2/9)
f = ( 15/3 -2/3) : ( 3/18+4/18)
f = 13/3 : 7/18
f = 13/3 x 18/7
f = 13/3 x 6*3/7
f = 13*6/7
f = 78/7